CVE-2025-25256
published 2025-08-12CVE-2025-25256: An improper neutralization of special elements used in an OS command ('OS Command Injection') vulnerability [CWE-78] in Fortinet FortiSIEM version 7.3.0…
PriorityP195critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
ITWEXPLOITVulnCheck KEVInitial access
Exploited in the wild
EPSS
55.34%
98.9th percentile
An improper neutralization of special elements used in an OS command ('OS Command Injection') vulnerability [CWE-78] in Fortinet FortiSIEM version 7.3.0 through 7.3.1, 7.2.0 through 7.2.5, 7.1.0 through 7.1.7, 7.0.0 through 7.0.3 and before 6.7.9 allows an unauthenticated attacker to execute unauthorized code or commands via crafted CLI requests.
Affected
19 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| fortinet | fortinet | — | — |
| fortinet | fortisiem | — | — |
| fortinet | fortisiem | — | — |
| fortinet | fortisiem | >= 5.4.0 < 6.7.10 | 6.7.10 |
| fortinet | fortisiem | 6.1.0 – 6.1.2 | — |
| fortinet | fortisiem | 6.2.0 – 6.2.1 | — |
| fortinet | fortisiem | 6.3.0 – 6.3.3 | — |
| fortinet | fortisiem | 6.4.0 – 6.4.4 | — |
| fortinet | fortisiem | 6.5.0 – 6.5.3 | — |
| fortinet | fortisiem | 6.6.0 – 6.6.5 | — |
| fortinet | fortisiem | 6.7.0 – 6.7.9 | — |
| fortinet | fortisiem | >= 7.0.0 < 7.0.4 | 7.0.4 |
| fortinet | fortisiem | 7.0.0 – 7.0.3 | — |
| fortinet | fortisiem | >= 7.1.0 < 7.1.8 | 7.1.8 |
| fortinet | fortisiem | 7.1.0 – 7.1.7 | — |
| fortinet | fortisiem | >= 7.2.0 < 7.2.6 | 7.2.6 |
| fortinet | fortisiem | 7.2.0 – 7.2.5 | — |
| fortinet | fortisiem | >= 7.3.0 < 7.3.2 | 7.3.2 |
| fortinet | fortisiem | 7.3.0 – 7.3.1 | — |
Detection & IOCsextracted from sources · hover to see the quote
- →The exploitation entry point is the phMonitor service on TCP port 7900; restrict or monitor inbound connections to this port on FortiSIEM appliances. ↗
- →Exploitation is delivered via crafted CLI requests to FortiSIEM; monitor for anomalous or unexpected CLI activity originating from unauthenticated sessions. ↗
- →Fortinet confirmed functional exploit code exists in the wild; treat any unpatched FortiSIEM instance as actively at risk and prioritize patching. ↗
- ·Fortinet states that exploitation does not produce distinctive IOCs, making post-compromise detection unreliable; assume compromise if unpatched and exposed. ↗
- ·FortiSIEM versions 5.4 through 6.6 are vulnerable but end-of-life and will not receive a patch; migration to a supported release is required. ↗
- ·Restricting access to port 7900 is only a workaround and does not remediate the underlying vulnerability; patching is still required. ↗
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vulncheck9.8CRITICAL
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Fortinet
An improper neutralization of special elements used in an OS command ('OS Command Injection') vulnerability [CWE-78] in...
vendor_fortinet·2025-08-12·CVSS 9.8
CVE-2025-25256 [CRITICAL] CWE-78 An improper neutralization of special elements used in an OS command ('OS Command Injection') vulnerability [CWE-78] in...
FG-IR-25-152: An improper neutralization of special elements used in an OS command ('OS Command Injection') vulnerability [CWE-78] in...
An improper neutralization of special elements used in an OS command ('OS Command Injection') vulnerability [CWE-78] in Fortinet FortiSIEM version 7.3.0 through 7.3.1, 7.2.0 through 7.2.5, 7.1.0 through 7.1.7, 7.0.0 through 7.0.3 and before 6.7.9 allows an unauthenticated attacker to execute unauthorized code or commands via crafted CLI requests.
CVEs: CVE-2025-25256
CWEs: CWE-78
CVSS: 9.8 (critical)
Affected products: FortiSIEM, Fortinet
GHSA
GHSA-6gxf-4w6m-j956: An improper neutralization of special elements used in an OS command ('OS Command Injection') vulnerability [CWE-78] in Fortinet FortiSIEM version 7
ghsa_unreviewed·2025-08-12
CVE-2025-25256 [CRITICAL] CWE-78 GHSA-6gxf-4w6m-j956: An improper neutralization of special elements used in an OS command ('OS Command Injection') vulnerability [CWE-78] in Fortinet FortiSIEM version 7
An improper neutralization of special elements used in an OS command ('OS Command Injection') vulnerability [CWE-78] in Fortinet FortiSIEM version 7.3.0 through 7.3.1, 7.2.0 through 7.2.5, 7.1.0 through 7.1.7, 7.0.0 through 7.0.3 and before 6.7.9 allows an unauthenticated attacker to execute unauthorized code or commands via crafted CLI requests.
VulnCheck
Fortinet FortiSIEM Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
vulncheck·2025·CVSS 9.8
CVE-2025-25256 [CRITICAL] Fortinet FortiSIEM Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Fortinet FortiSIEM Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
An improper neutralization of special elements used in an OS command ('OS Command Injection') vulnerability [CWE-78] in Fortinet FortiSIEM version 7.3.0 through 7.3.1, 7.2.0 through 7.2.5, 7.1.0 through 7.1.7, 7.0.0 through 7.0.3 and before 6.7.9 allows an unauthenticated attacker to execute unauthorized code or commands via crafted CLI requests.
Affected: Fortinet FortiSIEM
Required Action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Exploitation References: https://www.fortiguard.com/psirt/FG-IR-25-152; https://hs-8813571.f.hubspotemail.net/hubfs/8813571/PERISCOPE_VULNINTEL_20250903
Suricata
ET EXPLOIT Fortinet FortiSIEM Unauthenticated phMonitor Command Injection (CVE-2025-25256)
suricata·2025-08-15·CVSS 9.8
CVE-2025-25256 [CRITICAL] ET EXPLOIT Fortinet FortiSIEM Unauthenticated phMonitor Command Injection (CVE-2025-25256)
ET EXPLOIT Fortinet FortiSIEM Unauthenticated phMonitor Command Injection (CVE-2025-25256)
Rule: alert tcp any any -> $HOME_NET 7900 (msg:"ET EXPLOIT Fortinet FortiSIEM Unauthenticated phMonitor Command Injection (CVE-2025-25256)"; flow:established,to_server; content:"|5a 00 00 00|"; startswith; content:"|3c|archive_nfs_archive_dir|3e|"; fast_pattern; pcre:"/^[^\x3e]*?(?:[\x3b\x24\x2\x60\x7c]|\x25(?:3[bB]|2[46]|60|7[cC]))/R"; reference:url,labs.watchtowr.com/should-security-solutions-be-secure-maybe-were-all-wrong-fortinet-fortisiem-pre-auth-command-injection-cve-2025-25256/; reference:cve,2025-25256; classtype:attempted-user; sid:2064027; rev:1; metadata:affected_product FortiSIEM, attack_target Networking_Equipment, tls_state TLSDecrypt, created_at 2025_08_15, cve CVE_2025_25256, deploy
Nuclei
Fortinet FortiSIEM - OS Command Injection
nuclei·CVSS 9.8
CVE-2025-25256 [CRITICAL] Fortinet FortiSIEM - OS Command Injection
Fortinet FortiSIEM - OS Command Injection
Fortinet FortiSIEM 6.7.9
nfs
127.0.0.1
`echo${IFS}/`
local
payload: "\x5a\x00\x00\x00{{hex_decode(dec_to_hex(len(xml)))}}\x00\x00\x00\x6f\x42\x1e\x40\x00\x00\x00\x00{{xml}}"
tcp:
- inputs:
- data: "{{payload}}"
host:
- "tls://{{Hostname}}"
port: 7900
read-size: 1024
matchers:
- type: word
part: raw
words:
- "\x01\x00\x00\x00"
# digest: 4a0a004730450221008f410972088300464f6d85c45661c7d3faaad6fa10ffe47093d1c8f328ec03720220176d0334bd5c653eb8e02c53bda56ffe314ae75418fa88dcf3e86ac0beecb4a5:922c64590222798bb761d5b6d8e72950
Tenable
CVE-2026-35616: Fortinet FortiClientEMS improper access control vulnerability exploited in the wild
blogs_tenable·2026-04-06·CVSS 9.8
[CRITICAL] CVE-2026-35616: Fortinet FortiClientEMS improper access control vulnerability exploited in the wild
## Cloud Exposure
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## Vulnerability Exposure
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## AI Exposure
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## OT/IoT Exposure
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## Identity Exposure
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## Business needs
Active Directory
AI Security Posture Management (AI-SPM)
AWS security
Azure security
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Tenable
CVE-2025-64155 PoC released Command Injection Vulnerability
blogs_tenable·2026-01-14·CVSS 9.8
[CRITICAL] CVE-2025-64155 PoC released Command Injection Vulnerability
## Cloud Exposure
Tenable Cloud Security (CNAPP) Request a demo
Tenable Cloud Vulnerability Management Request a demo
Tenable CIEM Request a demo
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## Vulnerability Exposure
Tenable Vulnerability Management Try for free
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## AI Exposure
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## OT/IoT Exposure
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## Identity Exposure
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## Business needs
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Bleepingcomputer
Fortinet warns of critical FortiCloud SSO login auth bypass flaws
blogs_bleepingcomputer·2025-12-09·CVSS 9.8
CVE-2025-59718 [CRITICAL] Fortinet warns of critical FortiCloud SSO login auth bypass flaws
## Fortinet warns of critical FortiCloud SSO login auth bypass flaws
## Sergiu Gatlan
Fortinet has released security updates to address two critical vulnerabilities in FortiOS, FortiWeb, FortiProxy, and FortiSwitchManager that could allow attackers to bypass FortiCloud SSO authentication.
Threat actors can exploit the two security flaws tracked as CVE-2025-59718 (FortiOS, FortiProxy, FortiSwitchManager) and CVE-2025-59719 (FortiWeb) by abusing improper verification of cryptographic signature weaknesses in vulnerable products via a maliciously crafted SAML message.
However, as Fortinet explained in an advisory published today, the vulnerable FortiCloud feature is not enabled by default when the device is not FortiCare-registered.
"Please note that the FortiCloud SSO login feature is no
Bleepingcomputer
CISA gives govt agencies 7 days to patch new Fortinet flaw
blogs_bleepingcomputer·2025-11-19·CVSS 7.2
CVE-2025-58034 [HIGH] CISA gives govt agencies 7 days to patch new Fortinet flaw
## CISA gives govt agencies 7 days to patch new Fortinet flaw
## Sergiu Gatlan
CISA has ordered U.S. government agencies to secure their systems within a week against another vulnerability in Fortinet's FortiWeb web application firewall, which was exploited in zero-day attacks.
Tracked as CVE-2025-58034 , this OS command injection flaw can allow authenticated threat actors to execute code as root in low-complexity attacks that don't require user interaction.
"An Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') vulnerability [CWE-78] in FortiWeb may allow an authenticated attacker to execute unauthorized code on the underlying system via crafted HTTP requests or CLI commands," Fortinet said on Tuesday.
"The specific flaw exists within the imple
Bleepingcomputer
Fortinet warns of new FortiWeb zero-day exploited in attacks
blogs_bleepingcomputer·2025-11-18·CVSS 7.2
CVE-2025-58034 [HIGH] Fortinet warns of new FortiWeb zero-day exploited in attacks
## Fortinet warns of new FortiWeb zero-day exploited in attacks
## Sergiu Gatlan
Today, Fortinet released security updates to patch a new FortiWeb zero-day vulnerability that threat actors are actively exploiting in attacks.
Tracked as CVE-2025-58034 , this web application firewall security flaw was reported by Jason McFadyen of Trend Micro's Trend Research team.
Authenticated threat actors can gain code execution by successfully exploiting this OS command injection vulnerability in low-complexity attacks that don't require user interaction.
"An Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') vulnerability [CWE-78] in FortiWeb may allow an authenticated attacker to execute unauthorized code on the underlying system via crafted HTTP requests o
Tenable
CVE-2025-64446 FortiWeb Zero-Day Exploited
blogs_tenable·2025-11-14·CVSS 9.8
[CRITICAL] CVE-2025-64446 FortiWeb Zero-Day Exploited
## Cloud Exposure
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Secure your cloud
## Vulnerability Exposure
Tenable Vulnerability Management Try for free
Tenable Security Center Request a demo
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Tenable Patch Management Request a demo
Tenable Enclave Security Request a demo
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## AI Exposure
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## OT/IoT Exposure
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## Identity Exposure
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## Business needs
Active Directory
AI Security Posture Management (AI-SPM)
AWS security
Azure security
Cloud Security Posture Man
Bleepingcomputer
Fortinet confirms silent patch for FortiWeb zero-day exploited in attacks
blogs_bleepingcomputer·2025-11-14·CVSS 9.8
[CRITICAL] Fortinet confirms silent patch for FortiWeb zero-day exploited in attacks
## Fortinet confirms silent patch for FortiWeb zero-day exploited in attacks
## Sergiu Gatlan
Fortinet has confirmed that it has silently patched a critical zero-day vulnerability in its FortiWeb web application firewall, which is now " massively exploited in the wild."
The flaw was silently patched after reports that unauthenticated attackers were exploiting an unknown FortiWeb path traversal flaw in early October to create new administrative users on Internet-exposed devices.
The attacks were first identified by threat intel firm Defused on October 6, which published a proof-of-concept exploit and reported that an "unknown Fortinet exploit (possibly a CVE-2022-40684 variant)" is being used to send HTTP POST requests to the /api/v2.0/cmdb/system/admin%3f/../../../../../cgi-bin/fwbcgi
Wiz
Crying Out Cloud Newsletter - September 2025 | Wiz
blogs_wiz·2025-09-07·CVSS 8.1
[HIGH] Crying Out Cloud Newsletter - September 2025 | Wiz
Welcome back! In this edition, we bring you the latest in cloud security - noteworthy incidents, exclusive data, and crucial vulnerabilities. Let's dive in.
## 🔍 Highlights
s1ngularity: Supply Chain Attack Leaks Secrets on GitHub
On August 26, 2025, multiple malicious versions of the widely used Nx build system package were published to the npm registry. These versions contained a post-installation malware script designed to harvest sensitive developer assets, including cryptocurrency wallets, GitHub and npm tokens, SSH keys, and more. The malware leveraged AI command-line tools (including Claude, Gemini, and Q) to aid in their reconnaissance efforts, and then exfiltrated the stolen data to publicly accessible attacker-created repositories within victims’ GitHub accounts.
Learn more in
Tenable
CVE-2025-25256: Proof of Concept Released for Critical Fortinet FortiSIEM Command Injection Vulnerability
blogs_tenable·2025-08-13·CVSS 9.8
[CRITICAL] CVE-2025-25256: Proof of Concept Released for Critical Fortinet FortiSIEM Command Injection Vulnerability
## Cloud Exposure
Tenable Cloud Security (CNAPP) Request a demo
Tenable Cloud Vulnerability Management Request a demo
Tenable CIEM Request a demo
Secure your cloud
## Vulnerability Exposure
Tenable Vulnerability Management Try for free
Tenable Security Center Request a demo
Tenable Web App Scanning Try for free
Tenable Patch Management Request a demo
Tenable Enclave Security Request a demo
Tenable Attack Surface Management Request a demo
Tenable Nessus Try for free
## AI Exposure
Tenable AI Exposure Request a demo
## OT/IoT Exposure
Tenable OT Security Request a demo
## Identity Exposure
Tenable Identity Exposure Request a demo
## Business needs
Active Directory
AI Security Posture Management (AI-SPM)
AWS security
Azure security
Cloud Security Posture Man
Bleepingcomputer
Fortinet warns of FortiSIEM pre-auth RCE flaw with exploit in the wild
blogs_bleepingcomputer·2025-08-13·CVSS 9.8
[CRITICAL] Fortinet warns of FortiSIEM pre-auth RCE flaw with exploit in the wild
## Fortinet warns of FortiSIEM pre-auth RCE flaw with exploit in the wild
## Bill Toulas
Fortinet is warning about a remote unauthenticated command injection flaw in FortiSIEM that has in-the-wild exploit code, making it critical for admins to apply the latest security updates.
FortiSIEM is a central security monitoring and analytics system used for logging, network telemetry, and security incident alerts, serving as an integral part of security operation centers, where it's an essential tool in the hands of IT ops teams and analysts.
The product is generally used by governments, large enterprises, financial institutions, healthcare providers, and managed security service providers (MSSPs).
The flaw, tracked as CVE-2025-25256 and rated critical (CVSS: 9.8), impacts multiple branches o
Greynoiseio
NoiseLetter August 2025
blogs_greynoiseio
NoiseLetter August 2025
CVE Disclosure Early Warning Get an early warning when traffic spikes indicate a high likelihood of new disclosures
Compromised Asset Detection Find out immediately if an asset communicates with a malicious IP address
Vulnerability Prioritization Get real-time insight into active exploitation trends to better understand risk and severity
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Incident Investigation Add context to incidents to speed the determinations of scope and timelines
Threat Hunting Quickly identify anomalous behavior and enrich your threat hunting campaigns
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CVE Disclosure Early Warning Get an early warning when traffic spikes indicate a high likelihood of new disclosures
Compromised Asset Detection Fin
Wiz
CVE-2026-25972 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 9.9
CVE-2026-25972 [CRITICAL] CVE-2026-25972 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-25972 :
FortiSIEM vulnerability analysis and mitigation
An improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Fortinet FortiSIEM 7.4.0, FortiSIEM 7.3.0 through 7.3.4 may allow a remote unauthenticated attacker to provide arbitrary data enabling a social engineering attack via spoofed URL parameters.
Source : NVD
## 6.1
Score
Published March 10, 2026
Severity MEDIUM
CNA Score 4.3
Affected Technologies
FortiSIEM
Has Public Exploit No
Has CISA KEV Exploit No
CISA KEV Release Date N/A
CISA KEV Due Date N/A
Exploitation Probability Percentile (EPSS) 14.4
Exploitation Probability (EPSS) N/A
Affected packages and libraries
cpe:2.3:a:fortinet:fortisiem
Sources
Linux Severity MEDIUM Has Fix Added at: Mar 10, 2026
Recorded Future
August 2025 CVE Landscape
blogs_recorded_future·CVSS 8.8
[HIGH] August 2025 CVE Landscape
# August 2025 CVE Landscape
In August 2025, Recorded Future’s Insikt Group® identified eighteen high-impact vulnerabilities that should be prioritized for remediation. This represents a decrease from the 22 identified in July.
However, the number of Very Critical vulnerabilities has remained the same (16) compared to July. These vulnerabilities have affected the following vendors: Trend Micro, WinRAR, N-able, Cisco, Apple, Citrix, FreePBX, Git, Microsoft, D-Link, and Fortinet.
August was dominated by Citrix and D-Link flaws, which represented six of the eighteen vulnerabilities. Threat actors actively exploited Citrix NetScaler ADC, NetScaler Gateway, and Citrix Session Recording products, as well as D-Link DNR-322L and DCS-2530L routers.
Recorded Future Insikt Group’s CVE Findings fro
Wiz
CVE-2025-64155 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 9.9
CVE-2025-64155 [CRITICAL] CVE-2025-64155 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2025-64155 :
FortiSIEM vulnerability analysis and mitigation
An improper neutralization of special elements used in an os command ('os command injection') vulnerability in Fortinet FortiSIEM 7.4.0, FortiSIEM 7.3.0 through 7.3.4, FortiSIEM 7.1.0 through 7.1.8, FortiSIEM 7.0.0 through 7.0.4, FortiSIEM 6.7.0 through 6.7.10 may allow an attacker to execute unauthorized code or commands via crafted TCP requests.
Source : NVD
## 9.8
Score
Published January 13, 2026
Severity CRITICAL
CNA Score 9.8
Affected Technologies
FortiSIEM
Has Public Exploit Yes
Has CISA KEV Exploit No
CISA KEV Release Date N/A
CISA KEV Due Date N/A
Exploitation Probability Percentile (EPSS) 23.2
Exploitation Probability (EPSS) 0.1
Affected packages and libraries
cpe:2.3:a:fortinet:fortisiem
Sour
Recorded Future
August 2025 CVE Landscape
blogs_recorded_future·CVSS 8.8
[HIGH] August 2025 CVE Landscape
## August 2025 CVE Landscape
In August 2025, Recorded Future’s Insikt Group ® identified eighteen high-impact vulnerabilities that should be prioritized for remediation. This represents a decrease from the 22 identified in July.
However, the number of Very Critical vulnerabilities has remained the same (16) compared to July. These vulnerabilities have affected the following vendors: Trend Micro, WinRAR, N-able, Cisco, Apple, Citrix, FreePBX, Git, Microsoft, D-Link, and Fortinet.
August was dominated by Citrix and D-Link flaws, which represented six of the eighteen vulnerabilities. Threat actors actively exploited Citrix NetScaler ADC, NetScaler Gateway, and Citrix Session Recording products, as well as D-Link DNR-322L and DCS-2530L routers.
Recorded Future Insikt Group’s CVE Findings f
https://fortiguard.fortinet.com/psirt/FG-IR-25-152https://www.theregister.com/2025/08/13/fortinet_discloses_critical_bug/https://github.com/watchtowrlabs/watchTowr-vs-FortiSIEM-CVE-2025-25256https://labs.watchtowr.com/should-security-solutions-be-secure-maybe-were-all-wrong-fortinet-fortisiem-pre-auth-command-injection-cve-2025-25256/
2025-08-12
Published
Exploited in the wild