CVE-2025-21391

CISA 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

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

Notes & references

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

Where this lands in 800-53

Vulnerability data triggers these controls during assessment and continuous monitoring.

• RA-5 · Vulnerability Monitoring and Scanning
• SI-2 · Flaw Remediation
• CM-6 · Configuration Settings
• SI-7 · Software, Firmware, and Information Integrity
• CM-8 · System Component Inventory

External lookups

• NVD · CVE-2025-21391
• CVE.org · CVE-2025-21391
• CISA KEV catalog (canonical)