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CVE-2026-32073 Microsoft CVE debrief

The Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability (CVE-2026-32073) is a high-severity vulnerability. The vulnerability is caused by a use-after-free issue in the Windows Ancillary Function Driver for WinSock, which allows an authorized attacker to elevate privileges locally. Defenders should verify exposure, apply patches, and monitor system logs. The CVE record was published on 2026-04-14T16:57:18.366Z and has not been modified since then. The vulnerability affects Windows 10, Windows 11, and Windows Server versions. Microsoft's official advisory provides additional information on the vulnerability and mitigation steps.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-14
Original CVE updated
2026-10-15
Advisory published
2026-04-14
Advisory updated
2026-10-15

Who should care

Defenders responsible for Windows systems, particularly those using Windows 10, Windows 11, and Windows Server versions, should assess exposure and apply patches.

Why it matters

CVE-2026-32073 is a high-severity elevation of privilege vulnerability in Windows Ancillary Function Driver for WinSock. Defenders should verify exposure, apply patches, and monitor system logs.

  • Verify exposure and apply patches to prevent potential elevation of privileges
  • Monitor system logs for exploitation attempts
  • Assess and update vulnerability management processes

Technical summary

The Windows Ancillary Function Driver for WinSock has a use-after-free vulnerability, allowing an authorized attacker to elevate privileges locally. The vulnerability is caused by a use-after-free issue in the Windows Ancillary Function Driver for WinSock. The vulnerability affects Windows 10, Windows 11, and Windows Server versions. Defenders should verify exposure, apply patches, and monitor system logs.

Defensive priority

Defenders should prioritize verifying exposure and applying patches for Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability.

Recommended defensive actions

  • Verify exposure by checking Windows Ancillary Function Driver for WinSock versions
  • Apply patches from Microsoft
  • Monitor system logs for potential exploitation attempts

Evidence notes

The CVE Program record and NVD vulnerability detail provide information on the vulnerability. Microsoft's official advisory is referenced. The vulnerability has a CVSS score of 7 and a severity rating of HIGH. The CVE record was published on 2026-04-14T16:57:18.366Z and has not been modified since then. The vulnerability affects Windows Ancillary Function Driver for WinSock. Defenders should verify exposure and apply patches.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-32073 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-32073

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-32073 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-32073

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.