CVE-2026-70575: CWE-476: NULL Pointer Dereference in Microsoft Windows 11 version 23H2
Description
CVE-2026-70575 is a medium severity vulnerability in Microsoft Windows 11 version 23H2 involving a null pointer dereference in the Schannel component. This flaw allows an authorized attacker with low privileges to cause a denial of service over a network. The vulnerability does not impact confidentiality or integrity but affects availability. An official fix is available from Microsoft.
CVSS v3.1
Score 5.3medium
Affected software
Microsoft
Windows 11 version 23H2
Microsoft
Windows 11 Version 23H2
Microsoft
Windows 11 Version 24H2
Microsoft
Windows 11 Version 25H2
Microsoft
Windows 11 version 26H1
Microsoft
Windows Server 2022
Microsoft
Windows Server 2025
Microsoft
Windows Server 2025 (Server Core installation)
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-70575) involves a null pointer dereference in the Windows Schannel security package in Windows 11 version 23H2. An authorized attacker with low privileges can exploit this flaw remotely to cause a denial of service condition, resulting in system unavailability. The CVSS 3.1 base score is 5.3 (medium severity), reflecting network attack vector, high attack complexity, low privileges required, no user interaction, and impact limited to availability. Microsoft has published an official fix for affected versions.
Potential Impact
The vulnerability allows an authorized attacker to cause a denial of service over the network by triggering a null pointer dereference in the Schannel component. There is no impact on confidentiality or integrity. The denial of service can disrupt system availability for affected Windows 11 version 23H2 systems.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security updates provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70575 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-04T19:47:18.930Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70575","vendor":"Microsoft"}]
Threat ID: 6aa0453dacd9273b49fa9bd5
Added to database: 09/08/2026, 17:26:21 UTC
Last enriched: 10/16/2026, 21:41:37 UTC
Last updated: 10/23/2026, 15:10:14 UTC
Views: 31
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.