CVE-2025-21391: Microsoft Windows Storage Link Following Vulnerability

CISA Known Exploited Vulnerability (KEV)

Description

Microsoft Windows Storage contains a link following vulnerability that could allow for privilege escalation. This vulnerability could allow an attacker to delete data including data that results in the service being unavailable.

Required action (CISA)

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Notes

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21391 ; https://nvd.nist.gov/vuln/detail/CVE-2025-21391

Weakness behind it

CISA records this vulnerability as an instance of CWE-59. From there the chain continues into CAPEC attack patterns and ATT&CK techniques, all inside this corpus.

References

• NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-21391
• KEV catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog