Microsoft

CVE-2024-21447: Windows Authentication Elevation of Privilege Vulnerability

Is it exploited?

Reported, not confirmed by CISA. VulnCheck KEV lists it as exploited in the wild. CISA has not added it to its Known Exploited Vulnerabilities catalog as of 29 Oct 2026.

VulnCheck KEV lists it since 26 Feb 2025. It cites 1 public report, the first from 26 Feb 2025.

securelist.com

How likely is exploitation in the next 30 days?

1.4%

EPSS score, percentile 72.1 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?

7.8 High

CVSS v3.1 base score, given by the CNA

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

Advisories and patches (1)

Which versions are affected?

Affected

from 10.0.20348.0 to before 10.0.20348.2402
from 10.0.0 to before 10.0.22000.2899
from 10.0.19043.0 to before 10.0.19044.4291
from 10.0.22621.0 to before 10.0.22621.3447
from 10.0.19045.0 to before 10.0.19045.4291
from 10.0.22631.0 to before 10.0.22631.3447

and 2 more in the table below

Versions by product

Source: CISA KEV 2026.10.29, as of 29 Oct 2026; VulnCheck KEV, as of 30 Oct 2026; FIRST EPSS, as of 30 Oct 2026; CVE List, as of 30 Oct 2026. About the data.

Description

Windows Authentication Elevation of Privilege Vulnerability

Windows Authentication Elevation of Privilege Vulnerability

Source: CVE List, as of 30 Oct 2026. About the data.

What to do

Advisories and patches

Windows Authentication Elevation of Privilege Vulnerability (Vendor advisory)

This summary is based on the CVE record as of 30 Oct 2026. Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

Versions by product, as listed in the CVE record (8 products)

Microsoft Windows Server 2022
Status	Versions
Affected	from 10.0.20348.0 to before 10.0.20348.2402

Microsoft Windows 11 version 21H2
Status	Versions
Affected	from 10.0.0 to before 10.0.22000.2899

Microsoft Windows 10 Version 21H2
Status	Versions
Affected	from 10.0.19043.0 to before 10.0.19044.4291

Microsoft Windows 11 version 22H2
Status	Versions
Affected	from 10.0.22621.0 to before 10.0.22621.3447

Microsoft Windows 10 Version 22H2
Status	Versions
Affected	from 10.0.19045.0 to before 10.0.19045.4291

Microsoft Windows 11 version 22H3
Status	Versions
Affected	from 10.0.22631.0 to before 10.0.22631.3447

Microsoft Windows 11 Version 23H2
Status	Versions
Affected	from 10.0.22631.0 to before 10.0.22631.3447

Microsoft Windows Server 2022, 23H2 Edition (Server Core installation)
Status	Versions
Affected	from 10.0.25398.0 to before 10.0.25398.830

Source: CVE List, as of 30 Oct 2026. About the data.

Weakness

CWE-59

CWE-59: Improper Link Resolution Before File Access ('Link Following')

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.

Timeline

Date	Event
9 Apr 2024	CVE record published
3 May 2025	CVE record last updated

Known exploited Microsoft vulnerabilities

CVE-2026-96951: Microsoft Windows Command Injection Vulnerability (added 13 Oct 2026)
CVE-2026-65660: Microsoft SharePoint Code Injection Vulnerability (added 25 Sep 2026)
CVE-2026-81963: Microsoft Windows Link Following Vulnerability (added 8 Sep 2026)
CVE-2026-85880: Microsoft Windows Heap-Based Buffer Overflow Vulnerability (added 8 Sep 2026)
CVE-2019-1068: Microsoft SQL Server Remote Code Execution Vulnerability (added 26 Aug 2026)