CVE-2022-26937
published 2022-05-10CVE-2022-26937: Windows Network File System Remote Code Execution Vulnerability
PriorityP277critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
76.77%
99.5th percentile
Windows Network File System Remote Code Execution Vulnerability
Affected
21 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | windows_server | — | — |
| microsoft | windows_server_2008 | — | — |
| microsoft | windows_server_2008 | — | — |
| microsoft | windows_server_2008_r2_service_pack_1 | >= 6.1.7601.0 < 6.1.7601.25954 | 6.1.7601.25954 |
| microsoft | windows_server_2008_service_pack_2 | >= 6.0.6003.0 < 6.0.6003.21481 | 6.0.6003.21481 |
| microsoft | windows_server_2012 | — | — |
| microsoft | windows_server_2012 | >= 6.2.9200.0 < 6.2.9200.23714 | 6.2.9200.23714 |
| microsoft | windows_server_2012_r2 | >= 6.3.9600.0 < 6.3.9600.20371 | 6.3.9600.20371 |
| microsoft | windows_server_2016 | >= 10.0.14393.0 < 10.0.14393.5125 | 10.0.14393.5125 |
| microsoft | windows_server_2019 | >= 10.0.17763.0 < 10.0.17763.2928 | 10.0.17763.2928 |
| microsoft | windows_server_2022 | >= 10.0.20348.0 < 10.0.20348.707 | 10.0.20348.707 |
| microsoft | windows_server_version_20h2 | >= 10.0.0 < 10.0.19042.1706 | 10.0.19042.1706 |
| msrc | windows_server_2008_for_32-bit_systems_service_pack_2 | — | — |
| msrc | windows_server_2008_for_x64-based_systems_service_pack_2 | — | — |
| msrc | windows_server_2008_r2_for_x64-based_systems_service_pack_1 | — | — |
| msrc | windows_server_2012 | — | — |
| msrc | windows_server_2012_r2 | — | — |
| msrc | windows_server_2016 | — | — |
| msrc | windows_server_2019 | — | — |
| msrc | windows_server_2022 | — | — |
| msrc | windows_server_version_20h2 | — | — |
Detection & IOCsextracted from sources · hover to see the quote
- →Monitor NFS4 traffic on ports 2049/TCP and 2049/UDP for utf8string fields with lengths greater than 0x1000, which are suspicious and indicative of an exploitation attempt. ↗
- →Focus detection on NFS4 messages where fields parsed by Nfs4SvrXdrpDecode_STRING (as defined in RFC 3530) contain abnormally large utf8string values, as the vulnerable code path is XdrDecodeString called from Nfs4SvrXdrpDecode_STRING. ↗
- →Look for unauthenticated, specially crafted ONC RPC calls to the NFS service over the network; the exploit requires no authentication. ↗
- →Parse ONC RPC Fragment headers on TCP sessions to NFS; monitor for oversized utf8string buffer requests in NFSv2/NFSv3 NFS4 messages, as the attacker would request a large buffer to increase probability of failed allocation. ↗
- ·CVE-2022-26937 affects NFSv2 and NFSv3 only; NFSv4.1 is NOT vulnerable. The temporary mitigation is to disable NFSv2 and NFSv3 via PowerShell before patching. ↗
- ·The string length threshold of 0x1000 for suspicious detection is based on typical file path string limits and may need tuning per server configuration. ↗
- ·Do NOT use the NFSv4.1 downgrade mitigation for CVE-2023-24941 unless CVE-2022-26937 (May 2022 patch) has already been applied, as NFSv2/v3 are vulnerable to CVE-2022-26937. ↗
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvdv2.07.5HIGHAV:N/AC:L/Au:N/C:P/I:P/A:P
vendor_msrc9.8CRITICAL
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Microsoft
Windows Network File System Remote Code Execution Vulnerability
vendor_msrc·2023-05-09·CVSS 9.8
CVE-2023-24941 [CRITICAL] CWE-908 Windows Network File System Remote Code Execution Vulnerability
Windows Network File System Remote Code Execution Vulnerability
FAQ: How could an attacker exploit this vulnerability?
This vulnerability could be exploited over the network by making an unauthenticated, specially crafted call to a Network File System (NFS) service to trigger a Remote Code Execution (RCE).
Windows Network File System: Windows Network File System
Microsoft: Microsoft
Customer Action Required: Yes
Impact: Remote Code Execution
Exploit Status: Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation More Likely;DOS:N/A
Reference: https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5026362
Reference: https://support.microsoft.com/help/5026362
Reference: https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5026370
Reference: https://sup
Microsoft
Windows Network File System Remote Code Execution Vulnerability
vendor_msrc·2022-06-14·CVSS 9.8
CVE-2022-30136 [CRITICAL] Windows Network File System Remote Code Execution Vulnerability
Windows Network File System Remote Code Execution Vulnerability
FAQ: How could an attacker exploit this vulnerability?
This vulnerability could be exploited over the network by making an unauthenticated, specially crafted call to a Network File System (NFS) service to trigger a Remote Code Execution (RCE).
Windows Network File System: Windows Network File System
Microsoft: Microsoft
Customer Action Required: Yes
Impact: Remote Code Execution
Exploit Status: Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation More Likely;Older Software Release:Exploitation More Likely;DOS:N/A
Reference: https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5014692
Reference: https://support.microsoft.com/help/5014692
Reference: https://catalog.update.microsoft.com/v7/site
Microsoft
Windows Network File System Remote Code Execution Vulnerability
vendor_msrc·2022-05-10·CVSS 9.8
CVE-2022-26937 [CRITICAL] Windows Network File System Remote Code Execution Vulnerability
Windows Network File System Remote Code Execution Vulnerability
FAQ: How could an attacker exploit this vulnerability?
This vulnerability could be exploited over the network by making an unauthenticated, specially crafted call to a Network File System (NFS) service to trigger a Remote Code Execution (RCE).
Windows Network File System: Windows Network File System
Microsoft: Microsoft
Customer Action Required: Yes
Impact: Remote Code Execution
Exploit Status: Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation More Likely;Older Software Release:Exploitation More Likely
Reference: https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5013941
Reference: https://support.microsoft.com/help/5013941
Reference: https://catalog.update.microsoft.com/v7/site/Search.
GHSA
GHSA-982c-jgv5-r7gp: Windows Network File System Remote Code Execution Vulnerability
ghsa_unreviewed·2022-05-11
CVE-2022-26937 [CRITICAL] GHSA-982c-jgv5-r7gp: Windows Network File System Remote Code Execution Vulnerability
Windows Network File System Remote Code Execution Vulnerability.
No detection rules found.
No public exploits indexed.
Trendmicro
Microsoft Network File System Remote Code Execution
blogs_trendmicro·2023-06-01·CVSS 9.8
CVE-2023-24941 [CRITICAL] Microsoft Network File System Remote Code Execution
## CVE-2023-24941: Microsoft Network File System Remote Code Execution
Learn about Microsoft Network file system remote code execution.
By: Trend Micro Research Jun 01, 2023 Read time: ( words)
Save to Folio
In this excerpt of a Trend Micro Vulnerability Research Service vulnerability report, Quinton Crist, Guy Lederfein, and Lucas Miller of the Trend Micro Research Team detail a recently patched remote code execution vulnerability in the Microsoft Network File Service (NFS). This bug was originally discovered by Wei in Kunlun Lab with Cyber KunLun . The vulnerability is triggered when handling incoming NFSv4.1 calls containing utf8strings when the server is low on memory. A remote, unauthenticated attacker could exploit this vulnerability by sending a crafted call to an affected serve
Trendmicro
Microsoft Network File System Remote Code Execution
blogs_trendmicro·2023-06-01·CVSS 9.8
CVE-2023-24941 [CRITICAL] Microsoft Network File System Remote Code Execution
# CVE-2023-24941: Microsoft Network File System Remote Code Execution
Learn about Microsoft Network file system remote code execution.
By: Trend Micro Research
2023/06/01
Read time: ( words)
Save to Folio
In this excerpt of a Trend Micro Vulnerability Research Service vulnerability report, Quinton Crist, Guy Lederfein, and Lucas Miller of the Trend Micro Research Team detail a recently patched remote code execution vulnerability in the Microsoft Network File Service (NFS). This bug was originally discovered by Wei in Kunlun Lab with Cyber KunLun. The vulnerability is triggered when handling incoming NFSv4.1 calls containing utf8strings when the server is low on memory. A remote, unauthenticated attacker could exploit this vulnerability by sending a crafted call to an affected server.
Trendmicro
Microsoft Network File System Remote Code Execution
blogs_trendmicro·2023-06-01·CVSS 9.8
CVE-2023-24941 [CRITICAL] Microsoft Network File System Remote Code Execution
## CVE-2023-24941: Microsoft Network File System Remote Code Execution
Learn about Microsoft Network file system remote code execution.
By: Trend Micro Research 2023/06/01 Read time: ( words)
Save to Folio
In this excerpt of a Trend Micro Vulnerability Research Service vulnerability report, Quinton Crist, Guy Lederfein, and Lucas Miller of the Trend Micro Research Team detail a recently patched remote code execution vulnerability in the Microsoft Network File Service (NFS). This bug was originally discovered by Wei in Kunlun Lab with Cyber KunLun . The vulnerability is triggered when handling incoming NFSv4.1 calls containing utf8strings when the server is low on memory. A remote, unauthenticated attacker could exploit this vulnerability by sending a crafted call to an affected server.
Tenable
Microsoft’s May 2023 Patch Tuesday Addresses 38 CVEs (CVE-2023-29336)
blogs_tenable·2023-05-09·CVSS 7.8
[HIGH] Microsoft’s May 2023 Patch Tuesday Addresses 38 CVEs (CVE-2023-29336)
## 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 June 2022 Patch Tuesday Addresses 55 CVEs (CVE-2022-30190)
blogs_tenable·2022-06-14·CVSS 7.8
[HIGH] Microsoft’s June 2022 Patch Tuesday Addresses 55 CVEs (CVE-2022-30190)
## 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, May 2022 Edition
blogs_krebs·2022-05-11·CVSS 7.5
CVE-2022-26925 [HIGH] Microsoft Patch Tuesday, May 2022 Edition
Microsoft today released updates to fix at least 74 separate security problems in its Windows operating systems and related software. This month’s patch batch includes fixes for seven “critical” flaws, as well as a zero-day vulnerability that affects all supported versions of Windows.
By all accounts, the most urgent bug Microsoft addressed this month is CVE-2022-26925 , a weakness in a central component of Windows security (the “ Local Security Authority ” process within Windows). CVE-2022-26925 was publicly disclosed prior to today, and Microsoft says it is now actively being exploited in the wild. The flaw affects Windows 7 through 10 and Windows Server 2008 through 2022.
Greg Wiseman , product manager for Rapid7 , said Microsoft has rated this vulnerability as important and assigned
Krebs
Microsoft Patch Tuesday, May 2022 Edition
blogs_krebs·2022-05-11·CVSS 7.5
CVE-2022-26925 [HIGH] Microsoft Patch Tuesday, May 2022 Edition
Microsoft today released updates to fix at least 74 separate security problems in its Windows operating systems and related software. This month’s patch batch includes fixes for seven “critical” flaws, as well as a zero-day vulnerability that affects all supported versions of Windows.
By all accounts, the most urgent bug Microsoft addressed this month is CVE-2022-26925, a weakness in a central component of Windows security (the “Local Security Authority” process within Windows). CVE-2022-26925 was publicly disclosed prior to today, and Microsoft says it is now actively being exploited in the wild. The flaw affects Windows 7 through 10 and Windows Server 2008 through 2022.
Greg Wiseman, product manager for Rapid7, said Microsoft has rated this vulnerability as important and assigned it a
Tenable
Microsoft’s May 2022 Patch Tuesday Addresses 73 CVEs (CVE-2022-26925)
blogs_tenable·2022-05-10·CVSS 8.1
[HIGH] Microsoft’s May 2022 Patch Tuesday Addresses 73 CVEs (CVE-2022-26925)
## 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
Talos
Microsoft Patch Tuesday for May 2022 — Snort rules and prominent vulnerabilities
blogs_talos·2022-05-10·CVSS 8.1
[HIGH] Microsoft Patch Tuesday for May 2022 — Snort rules and prominent vulnerabilities
## Microsoft Patch Tuesday for May 2022 — Snort rules and prominent vulnerabilities
Microsoft returned to its normal monthly patching volume in May, disclosing and fixing 74 vulnerabilities as part of the company’s latest security update. This month’s Patch Tuesday includes seven critical vulnerabilities after Microsoft disclosed more than 140 security issues in April .
The point-to-point tunneling feature in Windows contains two of the most serious vulnerabilities that could allow an attacker to execute remote code on a targeted RAS server machine. While CVE-2022-21972 and CVE-2022-23270 are rated “critical,” Microsoft stated the attack complexity is high since an adversary needs to win a race condition, making it less likely an attacker could exploit these issues.
CVE-2022-26931 and C
Qualys
May 2022 Patch Tuesday | Microsoft Releases 75 Vulnerabilities With 8 Critical; Adobe Releases 5 Advisories, 18 Vulnerabilities With 16 Critical.
blogs_qualys·2022-05-10·CVSS 5.6
[MEDIUM] May 2022 Patch Tuesday | Microsoft Releases 75 Vulnerabilities With 8 Critical; Adobe Releases 5 Advisories, 18 Vulnerabilities With 16 Critical.
## Table of Contents
Microsoft Patch Tuesday Summary
Notable Microsoft Vulnerabilities Patched
Microsoft Last But Not Least
Notable Adobe Vulnerabilities Patched
About Qualys Patch Tuesday
Discover and Prioritize Vulnerabilities in Vulnerability Management Detection Response (VMDR)
Rapid Response with Patch Management (PM)
Qualys Monthly Webinar Series
Join the webinar this Month in Vulnerabilities & Patches
## Microsoft Patch Tuesday Summary
Microsoft has fixed 75 vulnerabilities in the May 2022 update, including one advisory ( ADV220001 ) for Azure in response to CVE-2022-29972 , a publicly exposed Zero-Day Remote Code Execution (RCE) Vulnerability, and eight vulnerabilities classified as critical as they allow Remote Code Execution (RCE) or Elevation of Privileges. This month
Qualys
May 2022 Patch Tuesday | Microsoft Releases 75 Vulnerabilities With 8 Critical; Adobe Releases 5 Advisories, 18 Vulnerabilities With 16 Critical. | Qualys
blogs_qualys·2022-05-10·CVSS 5.6
[MEDIUM] May 2022 Patch Tuesday | Microsoft Releases 75 Vulnerabilities With 8 Critical; Adobe Releases 5 Advisories, 18 Vulnerabilities With 16 Critical. | Qualys
#### Table of Contents
- Microsoft Patch Tuesday Summary
- Notable Microsoft Vulnerabilities Patched
- Microsoft Last But Not Least
- Notable Adobe Vulnerabilities Patched
- About Qualys Patch Tuesday
- Discover and Prioritize Vulnerabilities in Vulnerability Management Detection Response (VMDR)
- Rapid Response with Patch Management (PM)
- Qualys Monthly Webinar Series
- Join the webinar this Month in Vulnerabilities & Patches
## Microsoft Patch Tuesday Summary
Microsoft has fixed 75 vulnerabilities in the May 2022 update, including one advisory ( ADV220001 ) for Azure in response to CVE-2022-29972, a publicly exposed Zero-Day Remote Code Execution (RCE) Vulnerability, and eight vulnerabilities classified as critical as they allow Remote Code Execution (RCE) or Elevation of Privileges.
Talos
Microsoft Patch Tuesday for May 2022 — Snort rules and prominent vulnerabilities
blogs_talos·2022-05-10·CVSS 8.1
CVE-2022-21972 [HIGH] Microsoft Patch Tuesday for May 2022 — Snort rules and prominent vulnerabilities
Microsoft returned to its normal monthly patching volume in May, disclosing and fixing 74 vulnerabilities as part of the company’s latest security update. This month’s Patch Tuesday includes seven critical vulnerabilities after Microsoft disclosed more than 140 security issues in April.
The point-to-point tunneling feature in Windows contains two of the most serious vulnerabilities that could allow an attacker to execute remote code on a targeted RAS server machine. While CVE-2022-21972 and CVE-2022-23270 are rated “critical,” Microsoft stated the attack complexity is high since an adversary needs to win a race condition, making it less likely an attacker could exploit these issues.
CVE-2022-26931 and CVE-2022-26923 are elevation of privilege vulnerabilities in Windows Kerberos and Windo
Crowdstrike
June Patch Tuesday 2022: Updates and Analysis
blogs_crowdstrike·CVSS 7.5
CVE-2026-20929 [HIGH] June Patch Tuesday 2022: Updates and Analysis
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 Charlotte AI AgentWorks Fuels Security's Agentic Ecosystem Mar 25, 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 Charlotte AI AgentWorks Fuels Security's Agentic Ecosystem Mar 25, 2026
Video Highlights the 4 Key Steps to Successful Incident Response Dec 02, 2019
Helping Non-Security Stakeholders Understand ATT&CK in 10 Minutes or Less [VI
Crowdstrike
May 2022 Patch Tuesday: Updates and Analysis
blogs_crowdstrike·CVSS 7.5
CVE-2026-20929 [HIGH] May 2022 Patch Tuesday: Updates and Analysis
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 Charlotte AI AgentWorks Fuels Security's Agentic Ecosystem Mar 25, 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 Charlotte AI AgentWorks Fuels Security's Agentic Ecosystem Mar 25, 2026
Video Highlights the 4 Key Steps to Successful Incident Response Dec 02, 2019
Helping Non-Security Stakeholders Understand ATT&CK in 10 Minutes or Less [VI
2022-05-10
Published