CVE-2026-20810 is a high-severity privilege escalation vulnerability affecting multiple versions of Microsoft Windows and Windows Server. It stems from a memory management flaw (CWE-590) in the Ancillary Function Driver for WinSock, allowing an authenticated local attacker to gain elevated privileges. With a CVSS score of 7.8, this vulnerability is easily exploitable with low attack complexity and no user interaction, leading to high impact on confidentiality, integrity, and availability. While not currently listed in CISA's KEV catalog and lacking public exploit code, it has garnered significant community discussion and media coverage, indicating awareness and potential for future exploitation.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 10.0.17763.8276CPE matchmatch criteria | cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:* | ||
< 10.0.17763.8276CPE matchmatch criteria | cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:* | ||
< 10.0.19044.6809CPE matchmatch criteria | cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:* | ||
< 10.0.19045.6809CPE matchmatch criteria | cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:* | ||
< 10.0.17763.8276CPE matchmatch criteria | cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.