Is CVE-2021-26879 in the CISA KEV catalog?

No. CVE-2021-26879 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-26879?

CVE-2021-26879 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-26879?

CVE-2021-26879 has an EPSS score of 3.36% (87th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-26879?

Install KB5000807 for Windows 10. Fixes are available for 17 affected products.

CVE & CISA-KEV Catalog

CVE-2021-26879

HIGHEPSS 87th pctl

7.5

CVSS v3

NVD

Description

Windows Network Address Translation (NAT) Denial of Service Vulnerability

How to fix

Remediation Available

Windows 10Windows

Install:KB5000807Microsoft

Windows 10 Version 1607Windows

Install:KB5000803Microsoft

Windows 10 Version 1803Windows

Install:KB5000809Microsoft

Windows 10 Version 1809Windows

Install:KB5000822Microsoft

Windows 10 Version 1909Windows

Install:KB5000808Microsoft

Windows 10 Version 2004Windows

Install:KB5000802Microsoft

Windows 10 Version 20H2Windows

Install:KB5000802Microsoft

Windows 8.1Windows

Install:KB5000848Microsoft

Install:KB5000853Microsoft

Windows Server 2012 R2Windows

Install:KB5000853Microsoft

Install:KB5000848Microsoft

Windows Server 2012 R2 (Server Core installation)Windows

Install:KB5000853Microsoft

Install:KB5000848Microsoft

Windows Server 2016Windows

Install:KB5000803Microsoft

Windows Server 2016 (Server Core installation)Windows

Install:KB5000803Microsoft

Windows Server 2019Windows

Install:KB5000822Microsoft

Windows Server 2019 (Server Core installation)Windows

Install:KB5000822Microsoft

Windows Server, version 1909 (Server Core installation)Windows

Install:KB5000808Microsoft

Windows Server, version 2004 (Server Core installation)Windows

Install:KB5000802Microsoft

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

Install:KB5000802Microsoft

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 RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

3.36%probability of exploitation in 30 days

87thpercentile

Elevated risk: more likely to be exploited than 87% 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.