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CVE-2026-42914: Windows Kerberos Denial of Service Vulnerability

mediumCVSS 5.3CVE-2026-42914
Out-of-bounds read in Windows Kerberos allows an authorized attacker to deny service over a network.

CSIRTS triage

vendor: Microsoftproduct: Windows KerberosDenial of service
What
A denial of service vulnerability exists in Windows Kerberos.
Who is affected
Deployments using Windows Kerberos.
Urgency
Remediation is medium urgency due to moderate severity and no current exploitation reported.
Action
Apply the latest security updates for Windows Kerberos.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
medium — CVSS 5.3
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42914

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-42914coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Windows Kerberos Denial

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from Microsoft Security Response Center