CVE-2025-21309
published 2025-01-14CVE-2025-21309: Windows Remote Desktop Services Remote Code Execution Vulnerability
PriorityP261high8.1CVSS 3.1
AVNACHPRNUINSUCHIHAH
EPSS
14.98%
96.3th percentile
Windows Remote Desktop Services Remote Code Execution Vulnerability
Affected
31 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | windows_server_2012 | — | — |
| microsoft | windows_server_2012 | >= 6.2.9200.0 < 6.2.9200.25273 | 6.2.9200.25273 |
| microsoft | windows_server_2012_r2 | >= 6.3.9600.0 < 6.3.9600.22371 | 6.3.9600.22371 |
| microsoft | windows_server_2016 | < 10.0.14393.7699 | 10.0.14393.7699 |
| microsoft | windows_server_2016 | >= 10.0.14393.0 < 10.0.14393.7699 | 10.0.14393.7699 |
| microsoft | windows_server_2019 | < 10.0.17763.6775 | 10.0.17763.6775 |
| microsoft | windows_server_2019 | >= 10.0.17763.0 < 10.0.17763.6775 | 10.0.17763.6775 |
| microsoft | windows_server_2022 | < 10.0.20348.3091 | 10.0.20348.3091 |
| microsoft | windows_server_2022 | >= 10.0.20348.0 < 10.0.20348.3091 | 10.0.20348.3091 |
| 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 | cbl_mariner_1.0_arm | — | — |
| msrc | cbl_mariner_1.0_x64 | — | — |
| msrc | cbl_mariner_2.0_arm | — | — |
| msrc | cbl_mariner_2.0_x64 | — | — |
| msrc | redis-5.0.5-6.cm1.aarch64.rpm_on_cbl_mariner_1.0_arm | — | — |
| msrc | redis-5.0.5-6.cm1.x86_64.rpm_on_cbl_mariner_1.0_x64 | — | — |
| msrc | redis-6.2.6-1.cm2.aarch64.rpm_on_cbl_mariner_2.0_arm | — | — |
| msrc | redis-6.2.6-1.cm2.x86_64.rpm_on_cbl_mariner_2.0_x64 | — | — |
| msrc | redis-debuginfo-5.0.5-6.cm1.aarch64.rpm_on_cbl_mariner_1.0_arm | — | — |
| msrc | redis-debuginfo-5.0.5-6.cm1.x86_64.rpm_on_cbl_mariner_1.0_x64 | — | — |
| msrc | redis-debuginfo-6.2.6-1.cm2.aarch64.rpm_on_cbl_mariner_2.0_arm | — | — |
| msrc | redis-debuginfo-6.2.6-1.cm2.x86_64.rpm_on_cbl_mariner_2.0_x64 | — | — |
| msrc | windows_server_2012 | — | — |
Detection & IOCsextracted from sources · hover to see the quote
- →Target systems must have the Remote Desktop Gateway role enabled; monitor for unexpected or repeated RDP Gateway connection attempts which may indicate race condition exploitation attempts ↗
- →Exploitation requires winning a race condition (AC:H); look for high-frequency, rapid repeated connection attempts to the Remote Desktop Gateway service as a behavioral indicator ↗
- →Exploitation likelihood is rated 'More Likely' for latest software releases despite no known active exploitation; prioritize detection and patching on RD Gateway hosts ↗
- ·Vulnerability is specific to systems running the Windows Remote Desktop Gateway role; systems without this role are not affected attack surface ↗
- ·Customer action is required; patching is mandatory and not automatic — relevant KBs include KB5050008, KB5049983, KB5050009, KB5049984, KB5049993, KB5050004, KB5050048 ↗
CVSS provenance
nvdv3.18.1HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
vendor_msrc8.8HIGH
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Microsoft
Windows Remote Desktop Services Remote Code Execution Vulnerability
vendor_msrc·2025-01-14·CVSS 8.1
CVE-2025-21309 [HIGH] CWE-591 Windows Remote Desktop Services Remote Code Execution Vulnerability
Windows Remote Desktop Services Remote Code Execution Vulnerability
FAQ: According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?
Successful exploitation of this vulnerability requires an attacker to win a race condition.
FAQ: How could an attacker exploit this vulnerability?
An attacker could successfully exploit this vulnerability by attempting to connect to a system with the Remote Desktop Gateway role, triggering the race condition to create a use-after-free scenario, and then leveraging this to execute arbitrary code.
Windows Remote Desktop Services: Windows Remote Desktop Services
Microsoft: Microsoft
Customer Action Required: Yes
Impact: Remote Code Execution
Exploit Status: Publicly Disclosed:No;Exploited:No;Latest Softw
Microsoft
Integer overflow on 32-bit systems
vendor_msrc·2021-02-09·CVSS 8.8
CVE-2021-21309 [MEDIUM] CWE-190 Integer overflow on 32-bit systems
Integer overflow on 32-bit systems
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.
Mariner: Mariner
GitHub_M: GitHub_M
Customer Action Required: Yes
Remediation: CBL-Mariner Releases
Reference: https://learn.microsoft.com/
GHSA
GHSA-cwpx-vh5m-58gx: Windows Remote Desktop Services Remote Code Execution Vulnerability
ghsa_unreviewed·2025-01-14
CVE-2025-21309 [HIGH] CWE-591 GHSA-cwpx-vh5m-58gx: Windows Remote Desktop Services Remote Code Execution Vulnerability
Windows Remote Desktop Services Remote Code Execution Vulnerability
No detection rules found.
No public exploits indexed.
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
Tenable
Microsoft’s January 2025 Patch Tuesday Addresses 157 CVEs (CVE-2025-21333, CVE-2025-21334, CVE-2025-21335)
blogs_tenable·2025-01-14·CVSS 7.8
[HIGH] Microsoft’s January 2025 Patch Tuesday Addresses 157 CVEs (CVE-2025-21333, CVE-2025-21334, CVE-2025-21335)
## 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
Cloud Security Posture Man
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
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
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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