CVE-2025-21418

7.8

HIGH CVSS 3.1

Microsoft Windows Ancillary Function Driver for WinSock Heap-Based Buffer Overflow Vulnerability - [Actively Exploited]

Description

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

INFO

Published Date :

Feb. 11, 2025, 6:15 p.m.

Last Modified :

Feb. 12, 2025, 6:14 p.m.

Remotely Exploit :

No

Source :

[email protected]

CISA Notification

CISA KEV (Known Exploited Vulnerabilities)

For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.

Due Date: Mar 04, 2025

Alert Date: Feb 11, 2025 | 195 days ago

Description :

Microsoft Windows Ancillary Function Driver for WinSock contains a heap-based buffer overflow vulnerability that allows for privilege escalation, enabling a local attacker to gain SYSTEM privileges.

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

The following products are affected by CVE-2025-21418 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID	Vendor	Product
1	Microsoft	windows_server_2008
2	Microsoft	windows_server_2012
3	Microsoft	windows_server_2016
4	Microsoft	windows_server_2019
5	Microsoft	windows_10_1607
6	Microsoft	windows_10_1809
7	Microsoft	windows_10_21h2
8	Microsoft	windows_10_22h2
9	Microsoft	windows_server_2022
10	Microsoft	windows_11_22h2
11	Microsoft	windows_10_1507
12	Microsoft	windows
13	Microsoft	windows_11_23h2
14	Microsoft	windows_server_2022_23h2
15	Microsoft	windows_server_23h2
16	Microsoft	windows_server_2012_r2
17	Microsoft	windows_server_2008_r2
18	Microsoft	windows_server_2008_sp2
19	Microsoft	windows_11_24h2
20	Microsoft	windows_server_2025

: Total Affected Vendor : 1 | Products : 20

CVSS Scores

The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.

Score	Version	Severity	Vector	Exploitability Score	Impact Score	Source
	CVSS 3.1	HIGH				[email protected]

Solution

A vulnerability exists in the Windows Ancillary Function Driver for WinSock, and it should be addressed by installing the latest security updates.

Apply the latest security updates.
Reboot the system if required.

Public PoC/Exploit Available at Github

CVE-2025-21418 has a 1 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-21418.

URL	Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21418	Patch Vendor Advisory

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-21418 is associated with the following CWEs:

CWE-122: Heap-based Buffer Overflow

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-21418 weaknesses.

CAPEC-92: Forced Integer Overflow Forced Integer Overflow

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

ums91/CISA_BOT

CISA Bot is a GitHub bot that automatically monitors the Cybersecurity and Infrastructure Security Agency (CISA) Known Exploited Vulnerabilities (KEV) Catalog. When new vulnerabilities are published in the KEV, the bot creates GitHub issues in this repository with detailed information about each vulnerability.

Python

Updated: 3 days, 11 hours ago

2 stars 1 fork 1 watcher

Born at : Oct. 29, 2024, 10:19 a.m. This repo has been linked 201 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-21418 vulnerability anywhere in the article.

tripwire.com

Tripwire Patch Priority Index for February 2025

Tripwire's February 2025 Patch Priority Index (PPI) brings together important vulnerabilities for Microsoft.Up first on the list are patches for Microsoft Edge (Chromium-based) that resolve 4 remote c ...

Published Date: Mar 05, 2025 (5 months, 2 weeks ago)

CrowdStrike.com

February 2025 Patch Tuesday: Four Zero-Days and Three Critical Vulnerabilities Among 67 CVEs

Microsoft has released security updates for 67 vulnerabilities in its February 2025 Patch Tuesday rollout. Among these are three Critical vulnerabilities and four zero-days affecting the Windows NTLMv ...

Published Date: Feb 27, 2025 (5 months, 4 weeks ago)

CrowdStrike.com

February 2025 Patch Tuesday: Four Zero-Days and Three Critical Vulnerabilities Among 67 CVEs

Published Date: Feb 27, 2025 (5 months, 4 weeks ago)

CrowdStrike.com

February 2025 Patch Tuesday: Four Zero-Days and Three Critical Vulnerabilities Among 67 CVEs

Published Date: Feb 27, 2025 (5 months, 4 weeks ago)

CrowdStrike.com

February 2025 Patch Tuesday: Four Zero-Days and Three Critical Vulnerabilities Among 67 CVEs

Published Date: Feb 27, 2025 (5 months, 4 weeks ago)

CrowdStrike.com