OnlyFm252
Windows HTTP Protocol Stack

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

Critical CVSS 9.8 EPSS 0.9279 2022-01 archive

Executive Summary

None

Overview

9.8
CVSS CRITICAL
Critical
MS Severity
Not Exploited
MS Exploit Status
More Likely
MS Exploit Likelihood
Category Remote Code Execution
Released Jan 11 2022
Last Updated Jan 11 2022
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.9279 — 0.99815 percentile
NVD CVSS 9.8 CRITICAL — matches MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 8.5

EPSS Score

0.9279
probability of exploitation in the next 30 days
0.99815 percentile - updated 2026-06-21
View on FIRST.org

Affected Products

18 affected products
Product KB Article Severity Impact Restart Required
Windows 10 Version 1809 for 32-bit Systems 5009557 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1809 for ARM64-based Systems 5009557 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1809 for x64-based Systems 5009557 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 20H2 for 32-bit Systems 5009543 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 20H2 for ARM64-based Systems 5009543 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 21H1 for 32-bit Systems 5009543 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 21H1 for ARM64-based Systems 5009543 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 21H1 for x64-based Systems 5009543 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 21H2 for 32-bit Systems 5009543 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 21H2 for ARM64-based Systems 5009543 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 21H2 for x64-based Systems 5009543 (Security Update) Critical Remote Code Execution Yes
Windows 11 version 21H2 for ARM64-based Systems 5009566 (Security Update) Critical Remote Code Execution Yes
Windows 11 version 21H2 for x64-based Systems 5009566 (Security Update) Critical Remote Code Execution Yes
Windows Server 2019 5009557 (Security Update) Critical Remote Code Execution Yes
Windows Server 2019 (Server Core installation) 5009557 (Security Update) Critical Remote Code Execution Yes
Windows Server 2022 5009555 (Security Update) Critical Remote Code Execution Yes
Windows Server 2022 (Server Core installation) 5009555 (Security Update) Critical Remote Code Execution Yes
Windows Server, version 20H2 (Server Core Installation) 5009543 (Security Update) Critical Remote Code Execution Yes

Patches

4 patches
Article Type Restart
5009557 Security Update Yes
5009543 Security Update Yes
5009566 Security Update Yes
5009555 Security Update Yes

Known Exploits

On This Page