CVE-2022-21899 — Windows Extensible Firmware Interface Security Feature Bypass Vulnerability

Executive Summary

None

Overview

5.5

CVSS MEDIUM

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Security Feature Bypass

Released Jan 11 2022

Last Updated Jan 11 2022

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.0143 — 0.70671 percentile

NVD CVSS 5.5 MEDIUM — matches MSRC

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

ATTACK VECTOR

Local

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

Low

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

None

INTEGRITY

None

AVAILABILITY

High

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 4.8

EPSS Score

0.0143

probability of exploitation in the next 30 days

0.70671 percentile - updated 2026-08-14

View on FIRST.org

Affected Products

3 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 10 for 32-bit Systems	`5009585 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 for x64-based Systems	`5009585 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 7 for 32-bit Systems Service Pack 1 5009610 (Monthly Rollup) 5009621 (Security Only) Important Security Feature Bypass 5008244 Base: 5.5 Temporal: 4.8 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C 6.1.7601.25829 Yes 5009610 5009621 Windows 7 for x64-based Systems Service Pack 1 5009610 (Monthly Rollup) 5009621 (Security Only) Important Security Feature Bypass 5008244 Base: 5.5 Temporal: 4.8 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C 6.1.7601.25829 Yes 5009610 5009621 Windows 8.1 for 32-bit systems 5009624 (Monthly Rollup) 5009595 (Security Only) Important Security Feature Bypass 5008263 Base: 5.5 Temporal: 4.8 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C 6.3.9600.20246 Yes 5009624 5009595 Windows 8.1 for x64-based systems 5009624 (Monthly Rollup) 5009595 (Security Only) Important Security Feature Bypass 5008263 Base: 5.5 Temporal: 4.8 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C 6.3.9600.20246 Yes 5009624 5009595 Windows RT 8.1	`5009624 (Monthly Rollup)`	Important	Security Feature Bypass	Yes

Patches

2 patches

Article	Type	Restart
`5009585`	Security Update	Yes
`5009624`	Monthly Rollup	Yes

Exploits & PoC

No public exploit or PoC has been linked for this CVE yet. When available, references are sourced from public repositories and may be unverified or non-functional — review carefully before use.

Detection Rules

No public Sigma or Nuclei detection rule has been mapped to this CVE yet. Coverage is concentrated on exploited / high-profile vulnerabilities; check SigmaHQ for updates.

Acknowledgments

Abdelhamid Naceri working with Trend Micro Zero Day Initiative

References

MSRC Advisory MITRE NVD