CVE-2025-21311
published 2025-01-14CVE-2025-21311: Windows NTLM V1 Elevation of Privilege Vulnerability
PriorityP353critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
2.17%
80.3th percentile
Windows NTLM V1 Elevation of Privilege Vulnerability
Affected
11 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | squid | < squid 7.1-1 (forky) | squid 7.1-1 (forky) |
| microsoft | windows_11_24h2 | < 10.0.26100.2894 | 10.0.26100.2894 |
| microsoft | windows_11_version_24h2 | >= 10.0.26100.0 < 10.0.26100.2894 | 10.0.26100.2894 |
| microsoft | windows_server_2022_23h2 | < 10.0.25398.1369 | 10.0.25398.1369 |
| microsoft | windows_server_2025 | < 10.0.26100.2894 | 10.0.26100.2894 |
| microsoft | windows_server_2025 | >= 10.0.26100.0 < 10.0.26100.2894 | 10.0.26100.2894 |
| msrc | windows_11_version_24h2_for_arm64-based_systems | — | — |
| msrc | windows_11_version_24h2_for_x64-based_systems | — | — |
| msrc | windows_server_2022_23h2_edition | — | — |
| msrc | windows_server_2025 | — | — |
| squid | squid | >= 0 < 7.1-1 | 7.1-1 |
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
osv9.8CRITICAL
cisa7.2HIGH
vendor_debian9.8CRITICAL
vendor_msrc9.8CRITICAL
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OSV
CVE-2025-21311: Windows NTLM V1 Elevation of Privilege Vulnerability
osv·2025-01-14·CVSS 9.8
CVE-2025-21311 [CRITICAL] CVE-2025-21311: Windows NTLM V1 Elevation of Privilege Vulnerability
Windows NTLM V1 Elevation of Privilege Vulnerability
GHSA
GHSA-29f7-2v24-7hpm: Windows NTLM V1 Elevation of Privilege Vulnerability
ghsa_unreviewed·2025-01-14
CVE-2025-21311 [CRITICAL] CWE-303 GHSA-29f7-2v24-7hpm: Windows NTLM V1 Elevation of Privilege Vulnerability
Windows NTLM V1 Elevation of Privilege Vulnerability
CISA
Adminer Server-Side Request Forgery Vulnerability
cisa·2025-09-29·CVSS 7.2
CVE-2021-21311 [HIGH] CWE-918 Adminer Server-Side Request Forgery Vulnerability
Vulnerability: Adminer Server-Side Request Forgery Vulnerability
Affected: Adminer Adminer
Adminer contains a server-side request forgery vulnerability that, when exploited, allows a remote attacker to obtain potentially sensitive information.
Required Action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Notes: https://github.com/vrana/adminer/security/advisories/GHSA-x5r2-hj5c-8jx6 ; https://nvd.nist.gov/vuln/detail/CVE-2021-21311
Remediation Due Date: 2025-10-20
Microsoft
Windows NTLM V1 Elevation of Privilege Vulnerability
vendor_msrc·2025-01-14·CVSS 9.8
CVE-2025-21311 [CRITICAL] CWE-303 Windows NTLM V1 Elevation of Privilege Vulnerability
Windows NTLM V1 Elevation of Privilege Vulnerability
FAQ: According to the CVSS metric, the attack vector is network (AV:N) and the attack complexity is low (AC:L). What does that mean for this vulnerability?
The attack vector is Network (AV:N) because this vulnerability is remotely exploitable and can be exploited from the internet. The attack complexity is Low (AC:L) because an attacker does not require significant prior knowledge of the system and can achieve repeatable success with the payload against the vulnerable component.
Windows NTLM: Windows NTLM
Microsoft: Microsoft
Customer Action Required: Yes
Impact: Elevation of Privilege
Exploit Status: Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely
Reference: https://catalog.update.microsoft.com
Debian
CVE-2025-21311: squid - Windows NTLM V1 Elevation of Privilege Vulnerability
vendor_debian·2025·CVSS 9.8
CVE-2025-21311 [CRITICAL] CVE-2025-21311: squid - Windows NTLM V1 Elevation of Privilege Vulnerability
Windows NTLM V1 Elevation of Privilege Vulnerability
Scope: local
bookworm: open
bullseye: open
forky: resolved (fixed in 7.1-1)
sid: resolved (fixed in 7.1-1)
trixie: open
No detection rules found.
No public exploits indexed.
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
Tenable
Microsoft’s August 2025 Patch Tuesday Addresses 107 CVEs (CVE-2025-53779)
blogs_tenable·2025-08-12·CVSS 7.2
[HIGH] Microsoft’s August 2025 Patch Tuesday Addresses 107 CVEs (CVE-2025-53779)
## 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
Microsoft January 2025 Patch Tuesday fixes 8 zero-days, 159 flaws
blogs_bleepingcomputer·2025-01-14·CVSS 7.8
[HIGH] Microsoft January 2025 Patch Tuesday fixes 8 zero-days, 159 flaws
## Microsoft January 2025 Patch Tuesday fixes 8 zero-days, 159 flaws
## Lawrence Abrams
40 Elevation of Privilege Vulnerabilities
14 Security Feature Bypass Vulnerabilities
58 Remote Code Execution Vulnerabilities
24 Information Disclosure Vulnerabilities
20 Denial of Service Vulnerabilities
5 Spoofing Vulnerabilities
To learn more about the non-security updates released today, you can review our dedicated articles on the Windows 11 KB5050009 & KB5050021 cumulative updates and the Windows 10 KB5048652 cumulative update.
## Three actively exploited zero-day disclosed
This month's Patch Tuesday fixes three actively exploited and five publicly exposed zero-day vulnerabilities.
Microsoft classifies a zero-day flaw as one that is publicly disclosed or actively exploited while no offi
Krebs
Microsoft: Happy 2025. Here’s 161 Security Updates
blogs_krebs·2025-01-14·CVSS 9.8
[CRITICAL] Microsoft: Happy 2025. Here’s 161 Security Updates
Microsoft today unleashed updates to plug a whopping 161 security vulnerabilities in Windows and related software, including three “zero-day” weaknesses that are already under active attack. Redmond’s inaugural Patch Tuesday of 2025 bundles more fixes than the company has shipped in one go since 2017.
Rapid7‘s Adam Barnett says January marks the fourth consecutive month where Microsoft has published zero-day vulnerabilities on Patch Tuesday without evaluating any of them as critical severity at time of publication. Today also saw the publication of nine critical remote code execution (RCE) vulnerabilities.
The Microsoft flaws already seeing active attacks include CVE-2025-21333, CVE-2025-21334 and, you guessed it– CVE-2025-21335. These are sequential because all reside in Windows Hyper-V
Qualys
Microsoft and Adobe Patch Tuesday, January 2025 Security Update Review
blogs_qualys·2025-01-14
Microsoft and Adobe Patch Tuesday, January 2025 Security Update Review
## Table of Contents
Microsoft Patch Tuesday for January 2025
Adobe Patches for January 2025
Zero-day Vulnerabilities Patched in January Patch Tuesday Edition
Critical Severity Vulnerabilities Patched in January Patch Tuesday Edition
Other Microsoft Vulnerability Highlights
Microsoft Release Summary
Discover and Prioritize Vulnerabilities in Vulnerability Management, Detection & Response (VMDR)
Rapid Response with Patch Management (PM)
EVALUATE Vendor-Suggested Mitigation with Policy Compliance (PC)
Qualys Monthly Webinar Series
Happy New Year! As the calendar turns to January 2025, Microsoft’s first Patch Tuesday of 2025 has arrived. From zero-days to critical vulnerabilities, here’s what deserves your attention. Here’s a breakdown of what’s been patched.
## Microsoft Patch Tu
Talos
Microsoft Patch Tuesday for January 2025 — Snort rules and prominent vulnerabilities
blogs_talos·2025-01-14·CVSS 8.1
CVE-2025-21309 [HIGH] Microsoft Patch Tuesday for January 2025 — Snort rules and prominent vulnerabilities
## Microsoft Patch Tuesday for January 2025 — Snort rules and prominent vulnerabilities
Microsoft has released its monthly security update for January of 2025 which includes 159 vulnerabilities, including 12 that Microsoft marked as “critical.” The remaining vulnerabilities listed are classified as “important.”
One notable critically rated vulnerability that has been patched this month is CVE-2025-21309 , which is a remote code execution vulnerability affecting Windows Remote Desktop Services. Exploitation of this vulnerability could lead to arbitrary code execution on systems where the Remote Desktop Gateway role has been enabled. This vulnerability has been assigned a CVSS 3.1 score of 8.1 and is considered “more likely to be exploited” by Microsoft.
Another notable remote code execut
Qualys
Microsoft and Adobe Patch Tuesday, January 2025 Security Update Review | Qualys
blogs_qualys·2025-01-14
Microsoft and Adobe Patch Tuesday, January 2025 Security Update Review | Qualys
#### Table of Contents
- Microsoft Patch Tuesday for January 2025
- Adobe Patches for January 2025
- Zero-day Vulnerabilities Patched in January Patch Tuesday Edition
- Critical Severity Vulnerabilities Patched in January Patch Tuesday Edition
- Other Microsoft Vulnerability Highlights
- Microsoft Release Summary
- Discover and Prioritize Vulnerabilities in Vulnerability Management, Detection & Response (VMDR)
- Rapid Response with Patch Management (PM)
- EVALUATE Vendor-Suggested Mitigation with Policy Compliance (PC)
- Qualys Monthly Webinar Series
Happy New Year! As the calendar turns to January 2025, Microsoft’s first Patch Tuesday of 2025 has arrived. From zero-days to critical vulnerabilities, here’s what deserves your attention. Here’s a breakdown of what’s been patched.
## Micro
Krebs
Microsoft: Happy 2025. Here’s 161 Security Updates
blogs_krebs·2025-01-14·CVSS 9.8
[CRITICAL] Microsoft: Happy 2025. Here’s 161 Security Updates
Microsoft today unleashed updates to plug a whopping 161 security vulnerabilities in Windows and related software, including three “zero-day” weaknesses that are already under active attack. Redmond’s inaugural Patch Tuesday of 2025 bundles more fixes than the company has shipped in one go since 2017.
Rapid7 ‘s Adam Barnett says January marks the fourth consecutive month where Microsoft has published zero-day vulnerabilities on Patch Tuesday without evaluating any of them as critical severity at time of publication. Today also saw the publication of nine critical remote code execution (RCE) vulnerabilities.
The Microsoft flaws already seeing active attacks include CVE-2025-21333 , CVE-2025-21334 and, you guessed it– CVE-2025-21335 . These are sequential because all reside in Windows Hype
Talos
Microsoft Patch Tuesday for January 2025 — Snort rules and prominent vulnerabilities
blogs_talos·2025-01-14·CVSS 8.1
CVE-2025-21309 [HIGH] Microsoft Patch Tuesday for January 2025 — Snort rules and prominent vulnerabilities
Microsoft has released its monthly security update for January of 2025 which includes 159 vulnerabilities, including 12 that Microsoft marked as “critical.” The remaining vulnerabilities listed are classified as “important.”
One notable critically rated vulnerability that has been patched this month is CVE-2025-21309, which is a remote code execution vulnerability affecting Windows Remote Desktop Services. Exploitation of this vulnerability could lead to arbitrary code execution on systems where the Remote Desktop Gateway role has been enabled. This vulnerability has been assigned a CVSS 3.1 score of 8.1 and is considered “more likely to be exploited” by Microsoft.
Another notable remote code execution vulnerability in Window Object Linking and Embedding (OLE) was also patched this month
Crowdstrike
January 2025 Patch Tuesday: Updates and Analysis
blogs_crowdstrike·CVSS 7.5
CVE-2026-20929 [HIGH] January 2025 Patch Tuesday: Updates and Analysis
How CrowdStrike is Accelerating Exposure Evaluation as Adversaries Gain Speed Apr 06, 2026
STARDUST CHOLLIMA Likely Compromises Axios npm Package Apr 01, 2026
Falcon for IT Supports Windows Secure Boot Certificate Lifecycle Management Apr 01, 2026
Detecting CVE-2026-20929: Kerberos Authentication Relay via CNAME Abuse Mar 31, 2026
How CrowdStrike is Accelerating Exposure Evaluation as Adversaries Gain Speed Apr 06, 2026
STARDUST CHOLLIMA Likely Compromises Axios npm Package Apr 01, 2026
Falcon for IT Supports Windows Secure Boot Certificate Lifecycle Management Apr 01, 2026
Detecting CVE-2026-20929: Kerberos Authentication Relay via CNAME Abuse Mar 31, 2026
Video Highlights the 4 Key Steps to Successful Incident Response Dec 02, 2019
Helping Non-Security Stakeholders Understand AT
2025-01-14
Published