PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-61920 Microsoft CVE debrief

CVE-2026-61920 is a medium-severity vulnerability in Windows DNS, allowing authorized attackers to execute code over a network due to improper synchronization in concurrent execution. This race condition vulnerability affects Windows DNS, potentially impacting organizations with high-security requirements or exposed networks. Operators managing DNS services, platform administrators, vulnerability management teams, and security teams should review and mitigate potential threats. The CVE record was published on 2026-08-11T17:18:14.193Z and has not been modified since then. Further verification is needed to determine the full scope of affected systems and potential impacts.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
MEDIUM 6.6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-11
Original CVE updated
2026-09-02
Advisory published
2026-08-11
Advisory updated
2026-09-02

Who should care

Organizations using Windows DNS, especially those with high-security requirements or exposed networks, should be aware of this vulnerability. This includes operators managing DNS services, platform administrators, vulnerability management teams, and security teams responsible for reviewing and mitigating potential threats. These teams should verify Windows DNS configurations, review vendor patches or workarounds, and monitor for suspicious DNS activity to minimize potential impacts.

Technical summary

CVE-2026-61920 is a medium-severity vulnerability in Windows DNS, allowing authorized attackers to execute code over a network due to improper synchronization in concurrent execution. This race condition vulnerability affects Windows DNS, potentially impacting organizations with high-security requirements or exposed networks. The vulnerability can be exploited by attackers with network access, making it essential for defenders to review and apply vendor patches or workarounds. The evidence for CVE-2026-61920 is limited, primarily based on official records indicating a race condition vulnerability in Windows DNS.

Defensive priority

Medium-priority defensive review recommended due to potential network exposure.

Recommended defensive actions

  • Verify Windows DNS configurations for proper synchronization
  • Implement network monitoring for suspicious DNS activity
  • Review and apply vendor patches or workarounds
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
  • Review compensating controls for exposed systems while remediation is scheduled and verified

Evidence notes

The evidence for CVE-2026-61920 is limited, primarily based on official records indicating a race condition vulnerability in Windows DNS. Further verification is needed to determine the full scope of affected systems and potential impacts. Defenders should verify Windows DNS configurations, review vendor patches or workarounds, and monitor for suspicious DNS activity.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-61920 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-61920

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

  • CVE-2026-61920 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-61920

    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.