Reference page — cumulative record through Saturday, October 3, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-70575

CVE-2026-70575MEDIUM

Microsoft Windows 11 version 23H2 — Windows Schannel Denial of Service Vulnerability

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   L   N  U  N  N  H    6.5   .0095   60.0     —

AFFECTED
  Product                                         Versions        Fixed
  Windows 11 version 23H2                         10.0.22631.0 –  —
  Windows 11 Version 23H2                         10.0.22631.0 –  —
  Windows 11 Version 24H2                         10.0.26100.0 –  —
  Windows 11 Version 25H2                         10.0.26200.0 –  —
  Windows 11 version 26H1                         10.0.28000.0 –  —
  Windows Server 2022                             10.0.20348.0 –  —
  Windows Server 2025                             10.0.26100.0 –  —
  Windows Server 2025 (Server Core installation)  10.0.26100.0 –  —

TIMELINE
  Aug 4   Reserved by microsoft
  Sep 8   Published (CNA: microsoft)
  Sep 24  RESCORED — CVE-2026-70575 (Microsoft Windows 11 version 23H2). CVSS 5.3 → 6.5 (NVD).

CWE-476 · CNA: microsoft · CVSS v3.1 · 1 reference · NVD status: Analyzed

Description

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

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
August 4, 2026	Reserved	Reserved by microsoft
September 8, 2026	Published	Published (CNA: microsoft)
September 24, 2026	RESCORED	RESCORED — CVE-2026-70575 (Microsoft Windows 11 version 23H2). CVSS 5.3 → 6.5 (NVD).

Affected

Affected products and packages — 8 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Microsoft	Windows 11 version 23H2	—	10.0.22631.0	—
Microsoft	Windows 11 Version 23H2	—	10.0.22631.0	—
Microsoft	Windows 11 Version 24H2	—	10.0.26100.0	—
Microsoft	Windows 11 Version 25H2	—	10.0.26200.0	—
Microsoft	Windows 11 version 26H1	—	10.0.28000.0	—
Microsoft	Windows Server 2022	—	10.0.20348.0	—
Microsoft	Windows Server 2025	—	10.0.26100.0	—
Microsoft	Windows Server 2025 (Server Core installation)	—	10.0.26100.0	—

Weaknesses

CWE-476

References (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70575 [vendor-advisory, patch]

Authoritative record: CVE-2026-70575 at cve.org

Vendors: microsoft

Weaknesses: CWE-476

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-70575 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Saturday, October 3, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.