OnlyPatch
Microsoft Windows

CVE-2020-16996 — Kerberos Security Feature Bypass Vulnerability

Important CVSS 6.5 EPSS 0.02535 2020-12 archive

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 — 0.8329 percentile
NVD CVSS 6.5 MEDIUM — matches MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
None
INTEGRITY
High
AVAILABILITY
None
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 5.7

EPSS Score

0.02535
probability of exploitation in the next 30 days
0.8329 percentile - updated 2026-07-25
View on FIRST.org

Affected Products

8 affected products
Product KB Article Severity Impact Restart Required
Windows Server 2012 5000847 (Monthly Rollup) 5000840 (Security Only) Important Security Feature Bypass 4601348 Base: 6.5 Temporal: 5.7 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C Yes 5000847 5000840 Windows Server 2012 (Server Core installation) 5000847 (Monthly Rollup) 5000840 (Security Only) Important Security Feature Bypass 4601348 Base: 6.5 Temporal: 5.7 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C Yes 5000847 5000840 Windows Server 2012 R2 5000848 (Monthly Rollup) 5000853 (Security Only) Important Security Feature Bypass 4601384 Base: 6.5 Temporal: 5.7 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C Yes 5000848 5000853 Windows Server 2012 R2 (Server Core installation) 5000848 (Monthly Rollup) 5000853 (Security Only) Important Security Feature Bypass 4601384 Base: 6.5 Temporal: 5.7 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C Yes 5000848 5000853 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

5 patches
Article Type Restart
5000803 Security Update Yes
5000822 Security Update Yes
4592449 Security Update Yes
5000808 Security Update Yes
5000802 Security Update Yes

Known Exploits

Acknowledgments

None

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