---
id: CVE-2026-70575
title: >-
  Null pointer dereference in Windows Schannel allows an authorized attacker to
  deny service over a network.
summary: >-
  Null pointer dereference in Windows Schannel allows an authorized attacker to
  deny service over a network.
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-476
vendor: Microsoft
product: Windows 11 version 23H2
affected:
  - windows_11_version_23h2 >= 10.0.22631.0 < 10.0.22631.7582
  - windows_11_version_23h2 >= 10.0.22631.0 < 10.0.22631.7582
  - windows_11_version_24h2 >= 10.0.26100.0 < 10.0.26100.9445
  - windows_11_version_25h2 >= 10.0.26200.0 < 10.0.26200.9445
  - windows_11_version_26h1 >= 10.0.28000.0 < 10.0.28000.2954
  - windows_server_2022 >= 10.0.20348.0 < 10.0.20348.5622
  - windows_server_2025 >= 10.0.26100.0 < 10.0.26100.33438
  - >-
    windows_server_2025_server_core_installation >= 10.0.26100.0 <
    10.0.26100.33438
published: '2026-09-08'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T21:18:37.313'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-70575'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70575'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-08T20:39:07.866803Z'
ingestedAt: '2026-09-08T19:08:49.623Z'
epss: 0.00829
epssPercentile: 0.55528
---

## Overview

Null pointer dereference in Windows Schannel allows an authorized attacker to deny service over a network.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.