Technology · Microsoft
Microsoft Windows Ancillary Function Driver for WinSock vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 4 vulnerabilities in Microsoft Windows Ancillary Function Driver for WinSock: 0 in the last 7 days and 1 in the last 90 days, 1 of them critical and 1 exploited in the wild. The most recent, CVE-2026-68820, was published on 11 August 2026.
- Last 7 days
- 0
- Last 90 days
- 1
- Critical, all time
- 1
- Exploited in the wild
- 1
About Microsoft Windows Ancillary Function Driver for WinSock
The Windows Ancillary Function Driver (afd.sys) is a kernel-mode driver that provides the underlying support for Windows Sockets (WinSock) applications.
Latest Microsoft Windows Ancillary Function Driver for WinSock vulnerabilities
- CVE-2026-68820: Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.criticalexploited in the wildCVSS 7EPSS 0.3%
- CVE-2026-41088: Microsoft Windows WinSock Ancillary Function Driver type confusionhighCVSS 7.8EPSS 0.1%
- CVE-2026-34345: Microsoft Windows Ancillary Function Driver type confusion privilege escalationhighCVSS 7EPSS 0.0%
- CVE-2026-34344: Microsoft Windows type confusion in Ancillary Function Driver for WinSockhighCVSS 7.8
Most severe Microsoft Windows Ancillary Function Driver for WinSock vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2026-68820: Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.criticalexploited in the wildCVSS 7EPSS 0.3%
- CVE-2026-41088: Microsoft Windows WinSock Ancillary Function Driver type confusionhighCVSS 7.8EPSS 0.1%
- CVE-2026-34344: Microsoft Windows type confusion in Ancillary Function Driver for WinSockhighCVSS 7.8
- CVE-2026-34345: Microsoft Windows Ancillary Function Driver type confusion privilege escalationhighCVSS 7EPSS 0.0%
Vulnerabilities per week
The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 29 Jun 2026 | 0 | 0 | |
| 6 Jul 2026 | 0 | 0 | |
| 13 Jul 2026 | 0 | 0 | |
| 20 Jul 2026 | 0 | 0 | |
| 27 Jul 2026 | 0 | 0 | |
| 3 Aug 2026 | 0 | 0 | |
| 10 Aug 2026 | 1 | 1 | |
| 17 Aug 2026 | 0 | 0 | |
| 24 Aug 2026 | 0 | 0 | |
| 31 Aug 2026 | 0 | 0 | |
| 7 Sep 2026 | 0 | 0 | |
| 14 Sep 2026 | 0 | 0 | |
| 21 Sep 2026 | 0 | 0 |
How this is built
Junglewise Threat Intelligence collects vulnerabilities from NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories, and matches each one to the technologies and vendors it affects. Dates are the date a vulnerability was published, in UTC.
The pages are rebuilt from the database every hour. Frozen weekly and monthly reports never change once published, so they can be cited.
Use this data
The same data is at https://junglewise.ai/threats/technologies/windows-ancillary-function-driver-for-winsock.json, for scripts and language models. It is free to reuse under CC BY 4.0 with a link back to this page.
Cite as: Junglewise Threat Intelligence, "Microsoft Windows Ancillary Function Driver for WinSock vulnerabilities", https://junglewise.ai/threats/technologies/windows-ancillary-function-driver-for-winsock, 26 September 2026.