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CVE-2026-71351 Microsoft CVE debrief

A double free vulnerability in Windows Routing and Remote Access Service (RRAS) allows an authorized attacker to elevate privileges locally. This CVE was published on 2026-09-08T18:20:15.477Z and was last modified on 2026-09-22T17:02:52.893Z. The vulnerability has a CVSS score of 7 and a CVSS severity of HIGH. Defenders responsible for Windows systems, particularly those with RRAS deployed, should assess exposure and prioritize patching or mitigation to prevent local privilege escalation. The CVE record and NVD vulnerability detail provide information on the double free vulnerability in Windows RRAS. Microsoft has provided a patch and vendor advisory for this vulnerability.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 7
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

Defenders responsible for Windows systems, particularly those with RRAS deployed, should assess exposure and prioritize patching or mitigation to prevent local privilege escalation.

Why it matters

CVE-2026-71351 is a high-severity vulnerability in Windows RRAS that allows authorized attackers to escalate privileges locally. Defenders should verify exposure, apply patches or mitigations, and monitor for suspicious activity.

  • Local privilege escalation is possible for authorized attackers
  • Verification of RRAS exposure and patching is required
  • Monitoring for suspicious RRAS activity is recommended

Technical summary

The CVE record describes a double free vulnerability in Windows Routing and Remote Access Service (RRAS) that allows an authorized attacker to elevate privileges locally. The vulnerability has a CVSS score of 7 and a CVSS severity of HIGH. This vulnerability affects Windows systems with RRAS deployed. Defenders should verify exposure, apply patches or mitigations, and monitor for suspicious activity related to RRAS. The vulnerability is a high-severity issue that requires immediate attention from defenders.

Defensive priority

Defenders should prioritize verifying exposure of Windows Routing and Remote Access Service (RRAS) and applying patches or mitigations to prevent local privilege escalation.

Recommended defensive actions

  • Verify exposure of Windows Routing and Remote Access Service (RRAS) in the environment
  • Apply patches or mitigations provided by Microsoft to prevent local privilege escalation
  • Monitor for suspicious activity related to RRAS

Evidence notes

The CVE record and NVD vulnerability detail provide information on the double free vulnerability in Windows RRAS. Microsoft has provided a patch and vendor advisory for this vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-71351 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-71351

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

  • CVE-2026-71351 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-71351

    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.