CVE-2025-21204

Improper link resolution before file access ('link following') in Windows Update Stack allows an authorized attacker to elevate privileges locally.

Scoring

Severity

HIGH

CVSS base score

7.8

CVSS vector

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

EPSS probability

7.00%

CWE

CWE-59

Published

2025-04-08

Last modified

2026-08-10

Affected products

• Microsoft Windows 10 Version 1507
• Microsoft Windows 10 Version 1607
• Microsoft Windows 10 Version 1809
• Microsoft Windows 10 Version 21H2
• Microsoft Windows 10 Version 22H2
• Microsoft Windows 11 version 22H2
• Microsoft Windows 11 version 22H3
• Microsoft Windows 11 Version 23H2

Weakness type

• CWE-59

Related vulnerabilities

• CVE-2026-11940 — tarfile extraction filter bypass allows escaping the destination directory
• CVE-2026-7374 — Kubevirt: kubevirt virt-handler: privilege escalation and node compromise via symlink following vulnerability
• CVE-2026-63294 — Root RCE via image backup.yaml symlink
• CVE-2026-63293 — Arbitrary File Read/Write: metadata.yaml symlink in image allows host filesystem access as root
• CVE-2026-63125 — Incus vulnerable to root RCE via image backup.yaml symlink
• CVE-2026-57571 — Crawl4AI arbitrary file write via download filename path traversal
• CVE-2026-54352 — Budibase: Arbitrary file read by workspace-builder via PWA-zip symlink upload
• CVE-2026-53476 — Assisted-migration-agent: vddk tarball chained-symlink arbitrary file write

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