CVE-2025-55234
published 2025-09-09CVE-2025-55234: SMB Server might be susceptible to relay attacks depending on the configuration. An attacker who successfully exploited these vulnerabilities could perform…
PriorityP274critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
18.83%
97.0th percentile
SMB Server might be susceptible to relay attacks depending on the configuration. An attacker who successfully exploited these vulnerabilities could perform relay attacks and make the users subject to elevation of privilege attacks.
The SMB Server already supports mechanisms for hardening against relay attacks:
SMB Server signing
SMB Server Extended Protection for Authentication (EPA)
Microsoft is releasing this CVE to provide customers with audit capabilities to help them to assess their environment and to identify any potential device or software incompatibility issues before deploying SMB Server hardening measures that protect against relay attacks.
If you have not already enabled SMB Server hardening measures, we advise customers to take the following actions to be protected from these relay attacks:
Assess your environment by utilizing the audit capabilities that we are exposing in the September 2025 security updates. See Support for Audit Events to deploy SMB Server Hardening—SMB Server Signing & SMB Server EPA.
Adopt appropriate SMB Server hardening measures.
Affected
47 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | windows_10_1507 | < 10.0.10240.21128 | 10.0.10240.21128 |
| microsoft | windows_10_1607 | < 10.0.14393.8422 | 10.0.14393.8422 |
| microsoft | windows_10_1809 | < 10.0.17763.7792 | 10.0.17763.7792 |
| microsoft | windows_10_21h2 | < 10.0.19044.6332 | 10.0.19044.6332 |
| microsoft | windows_10_22h2 | < 10.0.19045.6332 | 10.0.19045.6332 |
| microsoft | windows_10_version_1507 | >= 10.0.10240.0 < 10.0.10240.21128 | 10.0.10240.21128 |
| microsoft | windows_10_version_1607 | >= 10.0.14393.0 < 10.0.14393.8422 | 10.0.14393.8422 |
| microsoft | windows_10_version_1809 | >= 10.0.17763.0 < 10.0.17763.7792 | 10.0.17763.7792 |
| microsoft | windows_10_version_21h2 | >= 10.0.19044.0 < 10.0.19044.6332 | 10.0.19044.6332 |
| microsoft | windows_10_version_22h2 | >= 10.0.19045.0 < 10.0.19045.6332 | 10.0.19045.6332 |
| microsoft | windows_11_22h2 | < 10.0.22621.5909 | 10.0.22621.5909 |
| microsoft | windows_11_23h2 | < 10.0.22631.5909 | 10.0.22631.5909 |
| microsoft | windows_11_24h2 | < 10.0.26100.6508 | 10.0.26100.6508 |
| microsoft | windows_11_version_22h2 | >= 10.0.22621.0 < 10.0.22621.5909 | 10.0.22621.5909 |
| microsoft | windows_11_version_22h3 | >= 10.0.22631.0 < 10.0.22631.5909 | 10.0.22631.5909 |
| microsoft | windows_11_version_23h2 | >= 10.0.22631.0 < 10.0.22631.5909 | 10.0.22631.5909 |
| microsoft | windows_11_version_24h2 | >= 10.0.26100.0 < 10.0.26100.6584 | 10.0.26100.6584 |
| microsoft | windows_server_2008 | — | — |
| microsoft | windows_server_2008_r2_service_pack_1 | >= 6.1.7601.0 < 6.1.7601.27929 | 6.1.7601.27929 |
| microsoft | windows_server_2008_service_pack_2 | >= 6.0.6003.0 < 6.0.6003.23529 | 6.0.6003.23529 |
| microsoft | windows_server_2012 | — | — |
| microsoft | windows_server_2012 | >= 6.2.9200.0 < 6.2.9200.25675 | 6.2.9200.25675 |
| microsoft | windows_server_2012_r2 | >= 6.3.9600.0 < 6.3.9600.22774 | 6.3.9600.22774 |
| microsoft | windows_server_2016 | < 10.0.14393.8422 | 10.0.14393.8422 |
| microsoft | windows_server_2016 | >= 10.0.14393.0 < 10.0.14393.8422 | 10.0.14393.8422 |
Detection & IOCsextracted from sources · hover to see the quote
- →Enable and monitor SMB Server signing audit events to detect clients connecting without signing, which may indicate relay attack exposure or incompatible clients. ↗
- →Monitor for SMB relay attack patterns (NTLM relay) targeting SMB Server endpoints where signing and EPA are not enforced; successful exploitation grants the privileges of the compromised user. ↗
- →Use the September 9, 2025 security update audit capabilities (KB5066913 guidance) to identify SMB clients not supporting signing or EPA before enforcing hardening, as exploitation is rated 'More Likely' and the vulnerability is publicly disclosed. ↗
- ·SMB Server Extended Protection for Authentication (EPA) is a supported hardening mechanism but must be explicitly adopted; absence of EPA leaves the server vulnerable to relay attacks. ↗
- ·The September 9, 2025 security updates add audit-only capabilities; actual protection requires separately adopting SMB Server signing and EPA hardening measures. ↗
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vendor_msrc8.8HIGH
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Microsoft
Windows SMB Elevation of Privilege Vulnerability
vendor_msrc·2025-09-09·CVSS 8.8
CVE-2025-55234 [HIGH] CWE-287 Windows SMB Elevation of Privilege Vulnerability
Windows SMB Elevation of Privilege Vulnerability
Description: SMB Server might be susceptible to relay attacks depending on the configuration. An attacker who successfully exploited these vulnerabilities could perform relay attacks and make the users subject to elevation of privilege attacks.
The SMB Server already supports mechanisms for hardening against relay attacks:
SMB Server signing
SMB Server Extended Protection for Authentication (EPA)
Microsoft is releasing this CVE to provide customers with audit capabilities to help them to assess their environment and to identify any potential device or software incompatibility issues before deploying SMB Server hardening measures that protect against relay attacks.
If you have not already enabled SMB Server hardening measures, we advise cu
GHSA
GHSA-9x8h-hfmc-8j5r: SMB Server might be susceptible to relay attacks depending on the configuration
ghsa_unreviewed·2025-09-09
CVE-2025-55234 [HIGH] CWE-287 GHSA-9x8h-hfmc-8j5r: SMB Server might be susceptible to relay attacks depending on the configuration
SMB Server might be susceptible to relay attacks depending on the configuration. An attacker who successfully exploited these vulnerabilities could perform relay attacks and make the users subject to elevation of privilege attacks.
The SMB Server already supports mechanisms for hardening against relay attacks:
SMB Server signing
SMB Server Extended Protection for Authentication (EPA)
Microsoft is releasing this CVE to provide customers with audit capabilities to help them to assess their environment and to identify any potential device or software incompatibility issues before deploying SMB Server hardening measures that protect against relay attacks.
If you have not already enabled SMB Server hardening measures, we advise customers to take the following actions to be protected from thes
No detection rules found.
No public exploits indexed.
Securelist
From cheats to exploits: Webrat spreading via GitHub
blogs_securelist·2025-12-23·CVSS 9.8
[CRITICAL] From cheats to exploits: Webrat spreading via GitHub
Table of Contents
Distribution and the malicious sample
Campaign objectives
Conclusion
Indicators of compromise
Authors
Maxim Starodubov
In early 2025, security researchers uncovered a new malware family named Webrat. Initially, the Trojan targeted regular users by disguising itself as cheats for popular games like Rust, Counter-Strike, and Roblox, or as cracked software. In September, the attackers decided to widen their net: alongside gamers and users of pirated software, they are now targeting inexperienced professionals and students in the information security field.
## Distribution and the malicious sample
In October, we uncovered a campaign that had been distributing Webrat via GitHub repositories since at least September. To lure in victims, the attackers leveraged vulnerab
Securelist
Webrat, disguised as exploits, is spreading via GitHub repositories
blogs_securelist·2025-12-23·CVSS 9.8
[CRITICAL] Webrat, disguised as exploits, is spreading via GitHub repositories
Table of Contents
- Distribution and the malicious sample
- Campaign objectives
- Conclusion
- Indicators of compromise
Authors
- Maxim Starodubov
In early 2025, security researchers uncovered a new malware family named Webrat. Initially, the Trojan targeted regular users by disguising itself as cheats for popular games like Rust, Counter-Strike, and Roblox, or as cracked software. In September, the attackers decided to widen their net: alongside gamers and users of pirated software, they are now targeting inexperienced professionals and students in the information security field.
## Distribution and the malicious sample
In October, we uncovered a campaign that had been distributing Webrat via GitHub repositories since at least September. To lure in victims, the attackers leveraged
Tenable
Cybersecurity Snapshot: AI Will Take Center Stage in Cyber in 2026, Google Says, as MITRE Revamps ATT&CK Framework
blogs_tenable·2025-11-07
Cybersecurity Snapshot: AI Will Take Center Stage in Cyber in 2026, Google Says, as MITRE Revamps ATT&CK Framework
## 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
Checkpoint
15th September – Threat Intelligence Report
blogs_checkpoint·2025-09-15
CVE-2025-55234 15th September – Threat Intelligence Report
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## 15th September – Threat Intelligence Report
For the latest discoveries in cyber research for the week of 15th September, please download our Threat Intelligence Bulletin .
TOP ATTACKS AND BREACHES
Panama’s Ministry of Economy and Finance (MEF) was hit by a ransomware attack that resulted in the theft of more than 1.5TB of data, including emails, financial documents, and budgeting details. The compromised information exposes sensitive institutional records tied to the country’s fiscal operations and management.
Bleepingcomputer
Windows 10 KB5065429 update includes 14 changes and fixes
blogs_bleepingcomputer·2025-09-09
Windows 10 KB5065429 update includes 14 changes and fixes
## Windows 10 KB5065429 update includes 14 changes and fixes
## Lawrence Abrams
Microsoft has released the KB5065429 cumulative update for Windows 10 22H2 and Windows 10 21H2, with fourteen fixes or changes, including fixes for unexpected UAC prompts and severe lag and stuttering issues with NDI streaming software.
The Windows 10 KB5065429 update is mandatory as it contains Microsoft's September 2025 Patch Tuesday security updates, which fix two publicly disclosed zero-day vulnerabilities and 81 flaws.
Windows users can install this update by going into Settings , clicking on Windows Update, and manually performing a 'Check for Updates .'
However, as this update is mandatory, it will automatically start installing in Windows once you check for updates. To make this more manageable, yo
Bleepingcomputer
Microsoft September 2025 Patch Tuesday fixes 81 flaws, two zero-days
blogs_bleepingcomputer·2025-09-09·CVSS 8.8
[HIGH] Microsoft September 2025 Patch Tuesday fixes 81 flaws, two zero-days
## Microsoft September 2025 Patch Tuesday fixes 81 flaws, two zero-days
## Lawrence Abrams
41 Elevation of Privilege Vulnerabilities
2 Security Feature Bypass Vulnerabilities
22 Remote Code Execution Vulnerabilities
16 Information Disclosure Vulnerabilities
3 Denial of Service Vulnerabilities
1 Spoofing Vulnerabilities
When BleepingComputer reports on the Patch Tuesday security updates, we only count those released on Patch Tuesday.
Therefore, the number of flaws does not include three Azure, one Dynamics 365 FastTrack Implementation Assets, two Mariner, five Microsoft Edge, and 1 Xbox vulnerabilities fixed earlier this month.
To learn more about the non-security updates released today, you can review our dedicated articles on the Windows 11 KB5065426 & KB5065431 cumulative updat
Qualys
Microsoft and Adobe Patch Tuesday, September 2025 Security Update Review
blogs_qualys·2025-09-09
Microsoft and Adobe Patch Tuesday, September 2025 Security Update Review
## Table of Contents
Microsoft Patch Tuesday for September 2025
Adobe Patches for September 2025
Zero-day Vulnerabilities Patched in September Patch Tuesday Edition
Critical Severity Vulnerabilities Patched in September Patch Tuesday Edition
Other Microsoft Vulnerability Highlights
Microsoft Release Summary
Discover and Prioritize Vulnerabilities inVulnerability Management, Detection & Response (VMDR)
Rapid Response with TruRisk Eliminate
Automating Risk Elimination and Accelerating Response: Meet Agent Sara
EVALUATE Vendor-Suggested Mitigation withPolicy Audit
Qualys Monthly Webinar Series
It’s the second Tuesday of September, and Microsoft has rolled out its latest security updates. Microsoft’s September 2025 Patch Tuesday has arrived, bringing a fresh wave of security fixes
Krebs
Microsoft Patch Tuesday, September 2025 Edition
blogs_krebs·2025-09-09·CVSS 8.8
[HIGH] Microsoft Patch Tuesday, September 2025 Edition
Microsoft Corp. today issued security updates to fix more than 80 vulnerabilities in its Windows operating systems and software. There are no known “zero-day” or actively exploited vulnerabilities in this month’s bundle from Redmond, which nevertheless includes patches for 13 flaws that earned Microsoft’s most-dire “critical” label. Meanwhile, both Apple and Google recently released updates to fix zero-day bugs in their devices.
Microsoft assigns security flaws a “critical” rating when malware or miscreants can exploit them to gain remote access to a Windows system with little or no help from users. Among the more concerning critical bugs quashed this month is CVE-2025-54918 . The problem here resides with Windows NTLM , or NT LAN Manager, a suite of code for managing authentication in a
Qualys
Microsoft and Adobe Patch Tuesday, September 2025 Security Update Review | Qualys
blogs_qualys·2025-09-09
Microsoft and Adobe Patch Tuesday, September 2025 Security Update Review | Qualys
#### Table of Contents
- Microsoft Patch Tuesday for September 2025
- Adobe Patches for September 2025
- Zero-day Vulnerabilities Patched in September Patch Tuesday Edition
- Critical Severity Vulnerabilities Patched in September Patch Tuesday Edition
- Other Microsoft Vulnerability Highlights
- Microsoft Release Summary
- Discover and Prioritize Vulnerabilities inVulnerability Management, Detection & Response (VMDR)
- Rapid Response with TruRisk Eliminate
- Automating Risk Elimination and Accelerating Response: Meet Agent Sara
- EVALUATE Vendor-Suggested Mitigation withPolicy Audit
- Qualys Monthly Webinar Series
It’s the second Tuesday of September, and Microsoft has rolled out its latest security updates. Microsoft’s September 2025 Patch Tuesday has arrived, bringing a fresh wave of s
Tenable
September 2025 Microsoft Patch Tuesday | Tenable®
blogs_tenable·2025-09-09
September 2025 Microsoft Patch Tuesday | Tenable®
## 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
Krebs
Microsoft Patch Tuesday, September 2025 Edition
blogs_krebs·2025-09-09·CVSS 8.8
[HIGH] Microsoft Patch Tuesday, September 2025 Edition
Microsoft Corp. today issued security updates to fix more than 80 vulnerabilities in its Windows operating systems and software. There are no known “zero-day” or actively exploited vulnerabilities in this month’s bundle from Redmond, which nevertheless includes patches for 13 flaws that earned Microsoft’s most-dire “critical” label. Meanwhile, both Apple and Google recently released updates to fix zero-day bugs in their devices.
Microsoft assigns security flaws a “critical” rating when malware or miscreants can exploit them to gain remote access to a Windows system with little or no help from users. Among the more concerning critical bugs quashed this month is CVE-2025-54918. The problem here resides with Windows NTLM, or NT LAN Manager, a suite of code for managing authentication in a Wi
Crowdstrike
September 2025 Patch Tuesday: Updates and Analysis
blogs_crowdstrike·CVSS 7.5
CVE-2026-20929 [HIGH] September 2025 Patch Tuesday: Updates and Analysis
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Helping Non-Security Stakeholders Understand ATT&CK in 10 Minutes or Less [VI
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55234https://www.vicarius.io/vsociety/posts/cve-2025-55234-detection-script-smb-server-vulnerability-affecting-microsoft-systemshttps://www.vicarius.io/vsociety/posts/cve-2025-55234-mitigation-script-smb-server-vulnerability-affecting-microsoft-systems
2025-09-09
Published