CVE-2020-16996 — Kerberos Security Feature Bypass Vulnerability

Executive Summary

None

Overview

6.5

CVSS MEDIUM

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Security Feature Bypass

Released Dec 8 2020

Last Updated Dec 8 2020

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.02535 — 0.82889 percentile

CVSS Vector

ATTACK VECTOR

Network

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

Low

USER INTERACTION

None

SCOPE

Unchanged

Temporal Score: 5.7

EPSS Score

0.02535

probability of exploitation in the next 30 days

0.82889 percentile - updated 2026-06-20

View on FIRST.org

Affected Products

12 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows Server 2012	`5000847 (Monthly Rollup) 5000840 (Security Only)`	Important	Security Feature Bypass	Yes
Windows Server 2012 (Server Core installation)	`5000847 (Monthly Rollup) 5000840 (Security Only)`	Important	Security Feature Bypass	Yes
Windows Server 2012 R2	`5000848 (Monthly Rollup) 5000853 (Security Only)`	Important	Security Feature Bypass	Yes
Windows Server 2012 R2 (Server Core installation)	`5000848 (Monthly Rollup) 5000853 (Security Only)`	Important	Security Feature Bypass	Yes
Windows Server 2016	`5000803 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server 2016 (Server Core installation)	`5000803 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server 2019	`5000822 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server 2019 (Server Core installation)	`5000822 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server, version 1903 (Server Core installation)	`4592449 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server, version 1909 (Server Core installation)	`5000808 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server, version 2004 (Server Core installation)	`5000802 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server, version 20H2 (Server Core Installation)	`5000802 (Security Update)`	Important	Security Feature Bypass	Yes

Patches

7 patches

Article	Type	Restart
`5000847 (Monthly Rollup) 5000840`	Monthly Rollup	Yes
`5000848 (Monthly Rollup) 5000853`	Monthly Rollup	Yes
`5000803`	Security Update	Yes
`5000822`	Security Update	Yes
`4592449`	Security Update	Yes
`5000808`	Security Update	Yes
`5000802`	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

Microsoft has not published researcher acknowledgments for this CVE, or they are not yet reflected in our data source. Check the MSRC advisory directly for the most current credit information.

References

MSRC Advisory MITRE NVD