Is CVE-2021-33779 in the CISA KEV catalog?

No. CVE-2021-33779 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-33779?

CVE-2021-33779 has a CVSS v3 base score of 8.1 (HIGH).

What is the EPSS score for CVE-2021-33779?

CVE-2021-33779 has an EPSS score of 2.23% (81th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-33779?

Install KB5004238 for Windows Server 2016. Fixes are available for 6 affected products.

CVE & CISA-KEV Catalog

CVE-2021-33779

HIGHEPSS 81th pctl

8.1

CVSS v3

NVD

Description

Windows AD FS Security Feature Bypass Vulnerability

How to fix

Remediation Available

Windows Server 2016Windows

Install:KB5004238Microsoft

Windows Server 2016 (Server Core installation)Windows

Install:KB5004238Microsoft

Windows Server 2019Windows

Install:KB5004244Microsoft

Windows Server 2019 (Server Core installation)Windows

Install:KB5004244Microsoft

Windows Server, version 2004 (Server Core installation)Windows

Install:KB5004237Microsoft

Windows Server, version 20H2 (Server Core Installation)Windows

Install:KB5004237Microsoft

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

2.23%probability of exploitation in 30 days

81stpercentile

Elevated risk: more likely to be exploited than 81% of all known CVEs.

References

Patch1

portal.msrc.microsoft.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.