CVE-2022-21907

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-01-12. 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 93%
CISA-KEV: Not listedEPSS PROB: 93%CVSS: 9.8Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

HTTP Protocol Stack Remote Code Execution Vulnerability

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
96(Track)
EG Risk 96/100SSVC: Track

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%
Exploitation93% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
93%
EPSS %ILE
100%
KEV
Not listed

Published

January 11, 2022

Last Modified

November 21, 2024

Advisory Details (3)

Auto-updated Sep 4, 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-2022-21907
generic

Packet Storm Security

http://packetstormsecurity.com/files/166730/Microsoft-HTTP-Protocol-Stack-Denial-Of-Service.html
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-2022-21907

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 3× in last 7d / 11× 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.

  1. 2026-09-06 13:45 UTCEPSS rescore
  2. 2026-09-05 15:25 UTCEPSS rescore
  3. 2026-09-04 05:04 UTCEPSS rescore
  4. 2026-08-30 19:14 UTCEPSS rescore
  5. 2026-08-30 01:19 UTCEPSS rescore
  6. 2026-08-28 21:38 UTCEPSS rescore
  7. 2026-08-24 14:13 UTCEPSS rescore
  8. 2026-08-21 23:46 UTCEPSS rescore
  9. 2026-08-18 13:45 UTCEPSS rescore
  10. 2026-08-12 13:48 UTCEPSS rescore
  11. 2026-08-09 13:44 UTCEPSS rescore
  12. 2026-08-01 04:13 UTCEPSS rescore
  13. 2026-07-28 15:33 UTCEPSS rescore
  14. 2026-07-23 02:08 UTCEG score recompute
  15. 2026-07-22 22:55 UTCEG score recompute
  16. 2026-07-18 10:02 UTCEPSS rescore
  17. 2026-07-18 10:02 UTCEPSS rescore
  18. 2026-07-06 16:25 UTCEPSS rescore
  19. 2026-07-06 16:25 UTCEPSS rescore
  20. 2026-07-06 02:21 UTCEPSS rescore
  21. 2026-07-05 02:28 UTCEPSS rescore
  22. 2026-06-25 13:48 UTCEPSS rescore
  23. 2026-06-23 21:31 UTCEPSS rescore
  24. 2026-06-23 21:31 UTCEPSS rescore
  25. 2026-06-15 17:46 UTCEPSS rescore
Show 20 more
  1. 2026-06-14 23:15 UTCEPSS rescore
  2. 2026-06-14 23:15 UTCEPSS rescore
  3. 2026-06-13 22:58 UTCEPSS rescore
  4. 2026-06-13 22:58 UTCEPSS rescore
  5. 2026-06-12 23:10 UTCEPSS rescore
  6. 2026-06-12 23:10 UTCEPSS rescore
  7. 2026-06-10 22:16 UTCEPSS rescore
  8. 2026-06-10 13:20 UTCEPSS rescore
  9. 2026-06-08 14:15 UTCEPSS rescore
  10. 2026-06-08 14:15 UTCEPSS rescore
  11. 2026-06-06 13:46 UTCEPSS rescore
  12. 2026-06-06 13:46 UTCEPSS rescore
  13. 2026-06-05 22:45 UTCEPSS rescore
  14. 2026-05-29 13:42 UTCEPSS rescore
  15. 2026-05-28 13:43 UTCEPSS rescore
  16. 2026-05-28 13:43 UTCEPSS rescore
  17. 2026-05-28 13:43 UTCEPSS rescore
  18. 2026-05-26 05:01 UTCEG score recompute
  19. 2026-05-26 05:01 UTCVendor advisory
  20. 2026-05-26 05:01 UTCGHSA enrichment

Publicly available exploits

(10 references)

Working exploit code is in the public domain (9 GitHub PoCs) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-51575
    First seen Jul 7, 2023

    Windows 10 v21H1 - HTTP Protocol Stack Remote Code Execution

    Open source ↗
  • GitHub PoC0xmaximus/Home-Demolisher
    First seen Nov 22, 2022

    PoC for CVE-2021-31166 and CVE-2022-21907

    Open source ↗
  • GitHub PoCMalwareman007/CVE-2022-21907
    First seen Oct 29, 2022

    POC for CVE-2022-21907: HTTP Protocol Stack Remote Code Execution Vulnerability.

    Open source ↗
  • GitHub PoCgpiechnik2/nmap-CVE-2022-21907
    First seen Apr 16, 2022

    Repository containing nse script for vulnerability CVE-2022-21907. It is a component (IIS) vulnerability on Windows. It allows remote code execution. The vulnerability affects the kernel module http. sys, which handles most basic IIS operations.

    Open source ↗
  • GitHub PoCpolakow/CVE-2022-21907
    First seen Apr 4, 2022

    A REAL DoS exploit for CVE-2022-21907

    Open source ↗
  • GitHub PoCmichelep/CVE-2022-21907-Vulnerability-PoC
    First seen Jan 23, 2022

    CVE-2022-21907 Vulnerability PoC

    Open source ↗
  • GitHub PoCZZ-SOCMAP/CVE-2022-21907
    First seen Jan 17, 2022

    HTTP Protocol Stack Remote Code Execution Vulnerability CVE-2022-21907

    Open source ↗
  • GitHub PoCp0dalirius/CVE-2022-21907-http.sys
    First seen Jan 17, 2022

    Proof of concept of CVE-2022-21907 Double Free in http.sys driver, triggering a kernel crash on IIS servers

    Open source ↗
  • GitHub PoCmauricelambert/CVE-2022-21907
    First seen Jan 15, 2022

    CVE-2022-21907: detection, protection, exploitation and demonstration. Exploitation: Powershell, Python, Ruby, NMAP and Metasploit. Detection and protection: Powershell. Demonstration: Youtube.

    Open source ↗
  • GitHub PoCcorelight/cve-2022-21907
    First seen Jan 11, 2022

    cve-2022-21907

    Open source ↗

Frequently asked(5)

What is CVE-2022-21907?
CVE-2022-21907 is a critical vulnerability published on January 11, 2022. HTTP Protocol Stack Remote Code Execution Vulnerability
When was CVE-2022-21907 disclosed?
CVE-2022-21907 was first published in the National Vulnerability Database on January 11, 2022, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2022-21907 actively exploited?
CVE-2022-21907 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 93% probability of exploitation in the next 30 days, which ranks it in the top 0.2% of all scored CVEs.
What is the CVSS score of CVE-2022-21907?
CVE-2022-21907 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2022-21907?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2022-21907, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2022-21907

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