CVE-2025-21418

CVE Enrichment

CVSS: 7.8 HIGH
EPSS: 1.57%
EPSS Percentile: 75.18%
CISA KEV: YES — Known Exploited Vulnerability

Description

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

Technical Details

CVSS Version: 3.1
CNA / NVD Source: [email protected]
Published: 12-Feb-2025 01:15
Last Modified: 17-Jun-2026 15:43
EPSS Date: 2026-10-24
CWE: CWE-122

CVSS Vector


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

CISA KEV Details

Date Added: 2025-02-11
Remediation Due: 2025-03-04
Known Ransomware Campaign Use: Unknown
Required Action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Notes: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21418 ; https://nvd.nist.gov/vuln/detail/CVE-2025-21418

Affected Products / Versions

microsoft / windows_10_1607
Version / affected range: * · before (exclusive) 10.0.10240.20915
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
microsoft / windows_10_1607
Version / affected range: * · before (exclusive) 10.0.10240.20915
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
microsoft / windows_10_1809
Version / affected range: * · before (exclusive) 10.0.17763.6893
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
microsoft / windows_10_1809
Version / affected range: * · before (exclusive) 10.0.17763.6893
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
microsoft / windows_10_21h2
Version / affected range: * · before (exclusive) 10.0.19044.5487
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:*
microsoft / windows_10_22h2
Version / affected range: * · before (exclusive) 10.0.19045.5487
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:*
microsoft / windows_11_22h2
Version / affected range: * · before (exclusive) 10.0.22621.4890
cpe:2.3:o:microsoft:windows_11_22h2:*:*:*:*:*:*:*:*
microsoft / windows_11_23h2
Version / affected range: * · before (exclusive) 10.0.22631.4890
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:*
microsoft / windows_11_24h2
Version / affected range: * · before (exclusive) 10.0.26100.3107
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:*
microsoft / windows_server_2008
Version / affected range: -
cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:*
microsoft / windows_server_2008
Version / affected range: r2
cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*
microsoft / windows_server_2012
Version / affected range: -
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
microsoft / windows_server_2012
Version / affected range: r2
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
microsoft / windows_server_2016
Version / affected range: * · before (exclusive) 10.0.14393.7785
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
microsoft / windows_server_2019
Version / affected range: * · before (exclusive) 10.0.17763.6893
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
microsoft / windows_server_2022
Version / affected range: * · before (exclusive) 10.0.20348.3148
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
microsoft / windows_server_2022_23h2
Version / affected range: * · before (exclusive) 10.0.25398.1425
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*
microsoft / windows_server_2025
Version / affected range: * · before (exclusive) 10.0.26100.3107
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*

References

Last enrichment sync: 25-Oct-2026 15:25
Sources: NVD · FIRST EPSS · CISA KEV
Latest successful provider update; providers refresh independently.

Reported Context (1)

2022, there have been three other afd.sys zero-days exploited in the wild, including CVE-2025-32709, CVE-2025-21418, and CVE-2024-38193. CVE-2024-38193 was reportedly exploited by North Korean hackers linked to the Microsoft Fixes 421 CVEs in August 2026 Patch Tuesday, Including Exploited Zero-Day

CVE (12)

People (2)

Threat Actors (1)

MITRE ATT&CK (1)

Vendors (1)

Products (12)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.