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CVE-2025-21955VulnerabilityPublished Updated

Microsoft · ksmbd: prevent connection release during oplock break notification

Affects MicrosoftSource GCVE Database

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Not known to be exploited.

Data as of 29 Oct 2026, 23:39 UTC

Severity
Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 2 Apr 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
Microsoft Security Response Center MicrosoftAffected
  • =2.0
Fixed in–

Description

This vulnerability, identified as CVE-2025-21955, relates to the ksmbd component and involves preventing connection release during an oplock break notification. The advisory does not provide detailed technical information or impact specifics. The affected version is exactly 2.0. No public exploit code or known exploitation in the wild is reported. No CVSS score is available, and no patch or remediation details are provided.

References

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