Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of ; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of ; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.
What to do
Required action, set by CISA
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Microsoft Windows Server 2012 (Server Core installation)
Status
Versions
Affected
from 6.2.9200.0 to before 6.2.9200.26280
Microsoft Windows Server 2012 R2
Status
Versions
Affected
from 6.3.9600.0 to before 6.3.9600.23338
Microsoft Windows Server 2012 R2 (Server Core installation)
Status
Versions
Affected
from 6.3.9600.0 to before 6.3.9600.23338
Microsoft Windows Server 2016
Status
Versions
Affected
from 10.0.14393.0 to before 10.0.14393.9418
Microsoft Windows Server 2016 (Server Core installation)
Status
Versions
Affected
from 10.0.14393.0 to before 10.0.14393.9418
Microsoft Windows Server 2019
Status
Versions
Affected
from 10.0.17763.0 to before 10.0.17763.9121
Microsoft Windows Server 2019 (Server Core installation)
Status
Versions
Affected
from 10.0.17763.0 to before 10.0.17763.9121
Microsoft Windows Server 2022
Status
Versions
Affected
from 10.0.20348.0 to before 10.0.20348.5499
Microsoft Windows Server 2025
Status
Versions
Affected
from 10.0.26100.0 to before 10.0.26100.33296
Microsoft Windows Server 2025 (Server Core installation)
Status
Versions
Affected
from 10.0.26100.0 to before 10.0.26100.33296
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.
About this vulnerability
Microsoft Windows Ancillary Function Driver for WinSock contains a use-after-free vulnerability that allows an authorized attacker to elevate privileges locally.
Summary: CISA's KEV catalog, as of .
CISA added CVE-2026-68820 to its Known Exploited Vulnerabilities (KEV) catalog on 11 Aug 2026.
CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
The due date CISA sets for the required action is 25 Aug 2026.
The CVE record was published on 11 Aug 2026, the same day it was added to KEV.
The CVE record carries a CVSS v3.1 base score of 7.0 (High), given by its CNA.
FIRST's EPSS model puts the probability of exploitation in the next 30 days at 0.3% (percentile 26.3), as of 28 Oct 2026.
CISA's SSVC assessment in the CVE record: exploitation active, automatable no, technical impact total.
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of ; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of ; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of . About the data.
Description
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.