How severe is CVE-2022-21907?

CVE-2022-21907 has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2022-21907?

Affected package information for CVE-2022-21907 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2022-21907?

No fixed version has been published for CVE-2022-21907 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2022-21907 actively exploited in the wild?

Yes. There are 23 known exploit references for CVE-2022-21907, including 1 documented proof-of-concept exploit on Exploit-DB and 14 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2022-21907?

CVE-2022-21907 has an EPSS (Exploit Prediction Scoring System) score of 91.9%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Which products and versions are affected by CVE-2022-21907?

CVE-2022-21907 affects microsoft windows 10 (4 versions, e.g. 20h2, 21h1, 21h2…); microsoft windows 11; microsoft windows server (2 versions, e.g. 20h2, 2022); microsoft windows server 2019. Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2022-21907 published, and has it been updated?

CVE-2022-21907 was published on January 11, 2022 and was last updated on November 21, 2024. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CVE-2022-21907

CRITICAL

HTTP Protocol Stack Remote Code Execution Vulnerability

Published

Jan 11, 2022

Updated

Nov 21, 2024

Affected

0 pkgs

Patched

None yet

Exploits

23 known

EPSS Exploitation Probability

via FIRST.org ↗

91.9%probability of exploitation in next 30 days

Very High Risk100th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

HTTP Protocol Stack Remote Code Execution Vulnerability

Affected Products

4 products · 17 configurations

windows 10microsoft

4 versions

20h221h121h21809

windows 11microsoft

all

windows servermicrosoft

2 versions

20h22022

windows server 2019microsoft

all

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-51575remotewindows

Windows 10 v21H1 - HTTP Protocol Stack Remote Code Execution

by nu11secur1ty · Jul 7, 2023

Exploit-DB Source

Frequently Asked Questions

HTTP Protocol Stack Remote Code Execution Vulnerability

O3 Security · Impact-Aware SCA

Is CVE-2022-21907 in your stack?

O3 detects CVE-2022-21907 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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