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Windows Process Activation Elevation of Privilege Vulnerability

CVE-2025-21204 is an elevation of privilege vulnerability in Windows Update Stack (rated Important, CVSS 7.8).

1 version

Facts

Microsoft id
CVE-2025-21204
Products
Windows Update Stack
Severity
Important
Impact
Elevation of Privilege
CVSS
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
Exploited
No
Publicly disclosed
No
Exploitability
Exploitation Less Likely
Customer action required
Yes
Release
2025-Apr
Assigned by
Microsoft
Weakness
CWE-59: Improper Link Resolution Before File Access ('Link Following')
MSRC revision
2.2
First captured by us
(from our first import of this list)
Microsoft last modified
Source
Security updates · open the original at Microsoft

Microsoft's revision notes

  1. Revision 1.0, 2025-04-08: Information published.
  2. Revision 2.0, 2025-04-09: The security updates for Windows 10 for 32-bit Systems and Windows 10 for x64-based Systems are now available.
  3. Revision 2.1, 2025-04-10: Added FAQ to explain that after installing the updates listed in the Security Updates table for your operating system, a new %systemdrive%\inetpub folder will be…
  4. Revision 2.2, 2025-06-04: Added an FAQ to explain the remediation steps customers need to take to be protected from CVE-2025-21204.

Microsoft says

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

Security updates,

Read Microsoft's full post

What Microsoft changed

One version so far. If Microsoft edits it, each change shows here with what was removed and added.

  1. First version we captured ·

    The text as we first saw it

    Seen by us · Microsoft's timestamp · Microsoft's page

Mentioning the same Microsoft ids

Last updated