CVE-2024-21427 — Windows Kerberos Security Feature Bypass Vulnerability

Executive Summary

None

Overview

7.5

CVSS HIGH

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Security Feature Bypass

Released Mar 12 2024

Last Updated Mar 12 2024

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.01522 — 0.71313 percentile

NVD CVSS 7.5 HIGH — matches MSRC

CVSS Vector

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

ATTACK VECTOR

Network

ATTACK COMPLEXITY

High

PRIVILEGES REQUIRED

Low

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

High

AVAILABILITY

High

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 6.5

EPSS Score

0.01522

probability of exploitation in the next 30 days

0.71313 percentile - updated 2026-06-21

View on FIRST.org

Affected Products

7 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows Server 2012 R2	`5036960 (Monthly Rollup)`	Important	Security Feature Bypass	Yes
Windows Server 2012 R2 (Server Core installation)	`5036960 (Monthly Rollup)`	Important	Security Feature Bypass	Yes
Windows Server 2016	`5036899 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server 2016 (Server Core installation)	`5036899 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server 2019	`5036896 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server 2019 (Server Core installation)	`5036896 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server 2022 5036909 (Security Update) 5035959 (SecurityHotpatchUpdate) Important Security Feature Bypass 5034860 Base: 7.5 Temporal: 6.5 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 10.0.20348.2402 10.0.20348.2333 Yes None Windows Server 2022 (Server Core installation) 5036909 (Security Update) 5035959 (SecurityHotpatchUpdate) Important Security Feature Bypass 5034860 Base: 7.5 Temporal: 6.5 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 10.0.20348.2402 10.0.20348.2333 Yes None Windows Server 2022, 23H2 Edition (Server Core installation)	`5036910 (Security Update)`	Important	Security Feature Bypass	Yes

Patches

4 patches

Article	Type	Restart
`5036960`	Monthly Rollup	Yes
`5036899`	Security Update	Yes
`5036896`	Security Update	Yes
`5036910`	Security Update	Yes

Known Exploits

No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.

Acknowledgments

Jo Sutton with Catalyst IT, Andrew Schwartz

References

MSRC Advisory MITRE NVD