CVE-2026-33099: CWE-416: Use After Free in Microsoft Windows 10 Version 1607
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-33099) involves a use-after-free condition in the Windows Ancillary Function Driver for WinSock on Windows 10 Version 1607 (build 10.0.14393.0). Exploitation requires local access with low privileges and no user interaction, but the attacker must overcome high attack complexity. Successful exploitation could result in elevation of privileges with high impact on confidentiality, integrity, and availability. Microsoft has released an official fix to remediate this vulnerability.
Potential Impact
The vulnerability allows a local authorized attacker to elevate their privileges on the affected Windows 10 Version 1607 system. This could lead to full control over the system, impacting confidentiality, integrity, and availability of the affected device. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official patch is available from Microsoft to fix this vulnerability. Users and administrators should apply the update provided in the Microsoft security advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33099 to remediate the issue.
CVE-2026-33099: CWE-416: Use After Free in Microsoft Windows 10 Version 1607
Description
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-33099) involves a use-after-free condition in the Windows Ancillary Function Driver for WinSock on Windows 10 Version 1607 (build 10.0.14393.0). Exploitation requires local access with low privileges and no user interaction, but the attacker must overcome high attack complexity. Successful exploitation could result in elevation of privileges with high impact on confidentiality, integrity, and availability. Microsoft has released an official fix to remediate this vulnerability.
Potential Impact
The vulnerability allows a local authorized attacker to elevate their privileges on the affected Windows 10 Version 1607 system. This could lead to full control over the system, impacting confidentiality, integrity, and availability of the affected device. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official patch is available from Microsoft to fix this vulnerability. Users and administrators should apply the update provided in the Microsoft security advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33099 to remediate the issue.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-03-17T20:15:23.718Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33099","vendor":"Microsoft"}]
Threat ID: 69de7a3a82d89c981fd6cf1a
Added to database: 4/14/2026, 5:32:42 PM
Last enriched: 4/14/2026, 5:50:35 PM
Last updated: 4/15/2026, 6:04:19 AM
Views: 8
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.