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CVE-2026-72939 Microsoft CVE debrief

A null pointer dereference vulnerability in Windows Routing and Remote Access Service (RRAS) could allow an authorized attacker to deny service over a network. This CVE was published on 2026-09-08T18:20:18.780Z and was last modified on 2026-09-22T12:29:22.893Z. The vulnerability exists in the Windows Routing and Remote Access Service (RRAS) and allows an authorized attacker to cause a denial of service over a network. The CVSS score is 6.5, indicating a medium severity. Windows RRAS administrators, security teams, and IT professionals responsible for network security and patch management should assess exposure and apply patches. The CVE record and NVD entry provide details on the

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-09-22
Advisory published
2026-09-08
Advisory updated
2026-09-22

Who should care

Windows RRAS administrators, security teams, and IT professionals responsible for network security and patch management should assess exposure and apply patches.

Why it matters

CVE-2026-72939 is a medium-severity vulnerability in Windows RRAS that could allow an authorized attacker to deny service. Defenders should assess exposure, apply patches, and monitor system logs.

  • Potential denial of service over a network
  • Requires verification of affected versions and exposure
  • Patching and configuration changes are necessary
  • Monitoring system logs for exploitation attempts is recommended

Technical summary

The vulnerability exists in the Windows Routing and Remote Access Service (RRAS) and allows an authorized attacker to cause a denial of service over a network. The CVSS score is 6.5, indicating a medium severity. This vulnerability could allow an attacker to disrupt network operations. Defenders should assess exposure, apply patches, and monitor system logs. The CVE record and NVD entry provide details on the vulnerability, including its CVSS score of 6.5 and MEDIUM severity. Microsoft has provided a patch and vendor advisory. The vulnerability could be exploited

Defensive priority

Medium priority for Windows RRAS administrators and security teams to assess exposure and apply patches.

Recommended defensive actions

  • Assess exposure of Windows RRAS systems to this vulnerability
  • Apply patches provided by Microsoft
  • Verify system configurations and network exposure
  • Monitor system logs for potential exploitation attempts

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its CVSS score of 6.5 and MEDIUM severity. Microsoft has provided a patch and vendor advisory.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-72939 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-72939

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-72939 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-72939

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.