Null pointer dereference in Windows Schannel

Publication date: 2026-09-08

Last updated on: 2026-09-24

Assigner: Microsoft Corporation

Description

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

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-08

Last Modified

2026-09-24

Generated

2026-09-29

AI Q&A

2026-09-10

EPSS Evaluated

2026-09-27

NVD

CVE-2026-70575

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_11_23h2	to 10.0.22631.7582 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7582 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9445 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9445 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9445 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9445 (exc)
microsoft	windows_11_26h1	to 10.0.28000.2954 (exc)
microsoft	windows_11_26h1	to 10.0.28000.2954 (exc)
microsoft	windows_server_2025	to 10.0.26100.33438 (exc)
microsoft	windows_server_2022	to 10.0.20348.5622 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-476	The product dereferences a pointer that it expects to be valid but is NULL.

Attack-Flow Graph

Executive Summary

This vulnerability is a null pointer dereference in Windows Schannel. It allows an authorized attacker to cause a denial of service over a network by exploiting this flaw.

Impact Analysis

An attacker could exploit this to crash systems or services relying on Schannel, leading to service disruption. It requires authorized access but could impact availability of network services.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Schannel component. Monitor Microsoft's security advisories for patches and implement network segmentation to limit exposure.

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