CVE-2022-26937

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-11. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.8EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 76%
CISA-KEV: Not listedEPSS PROB: 76%CVSS: 9.8Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Windows Network File System Remote Code Execution Vulnerability

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
79
EG Risk 79/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation76% × 40%
Automatability30% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
76%
EPSS %ILE
99th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (EG-KEV: elevated) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

May 10, 2022

Last Modified

January 2, 2025

Advisory Details (2)

Auto-updated Oct 2, 2026
Patch available. Sources: microsoft.
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2022-26937
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-26937

Vendor Advisories for CVE-2022-26937(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Data Freshness Timeline

(refreshed 5× in last 7d / 16× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 108 total refreshes for this CVE.

  1. 2026-10-03 14:23 UTCEPSS rescore
  2. 2026-10-03 14:22 UTCEPSS rescore
  3. 2026-09-30 15:52 UTCEG score recompute
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Publicly available exploits

(3 references)

Working exploit code is in the public domain (3 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCMalwareman007/CVE-2022-26937
    First seen Oct 7, 2022

    POC Of CVE-2022-26937

    Open source ↗
  • GitHub PoComair2084/CVE-2022-26937
    First seen Jun 17, 2022

    Windows Network File System Crash PoC

    Open source ↗
  • GitHub PoCcorelight/CVE-2022-26937
    First seen May 11, 2022

    A Zeek package to detect CVE-2022-26937, a vulnerability in the Network Lock Manager (NLM) protocol in Windows NFS server.

    Open source ↗

Frequently asked(5)

What is CVE-2022-26937?
CVE-2022-26937 is a critical vulnerability published on May 10, 2022. Windows Network File System Remote Code Execution Vulnerability
When was CVE-2022-26937 disclosed?
CVE-2022-26937 was first published on May 10, 2022, with the most recent update on January 2, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2022-26937 actively exploited?
CVE-2022-26937 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 76% probability of exploitation in the next 30 days (99th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2022-26937?
CVE-2022-26937 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2022-26937?
A fix for CVE-2022-26937 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2022-26937 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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