CVE-2026-59132: Windows TCP/IP Denial of Service Vulnerability

CSIRTS triage

What

Null pointer dereference in Windows TCP/IP stack allows remote denial of service.

Who is affected

Unauthorized remote attackers with network access to affected Windows systems.

Urgency

High severity (CVSS 7.5); network-exploitable DoS requires immediate patching.

Action

Apply Windows TCP/IP security updates from Microsoft.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source

Microsoft Security Response Center (INTL · vendor-psirt · site)

Severity

high — CVSS 7.5

Published

2026-08-11

Exploitation

Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-59132

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

• Moderate exploitation riskCVE-2026-591321.3% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 68% of all EPSS-scored CVEs.

Referenced CVEs

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

• critical[NEW] [critical] Microsoft Windows Products: Multiple vulnerabilitiescert-bund
• unknownexploitedNCSC-2026-0284 [1.00] [M/H] Vulnerabilities patched in Microsoft Windowsncsc-nl
• highCVE-2026-59132: Null pointer dereference in Windows TCP/IP allows an unauthorized attacker to deny service ove…nvd

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