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PatchSiren cyber security CVE debrief

CVE-2026-57976 Microsoft CVE debrief

CVE-2026-57976 is a medium-severity vulnerability in Active Directory Domain Services that allows an authorized attacker to deny service over a network. The vulnerability has a CVSS score of 6.5 and a CVSS severity of MEDIUM. The CVE record was published on 2026-07-14T17:17:11.120Z and was last modified on 2026-07-20T17:03:42.443Z. This vulnerability is caused by a null pointer dereference in Active Directory Domain Services. An authorized attacker can exploit this vulnerability to deny service over a network. The vulnerability has been analyzed and has a CVSS vector of CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H. Administrators and users of Active Directory Domain Services should be aware of this vulnerability and take necessary precautions to mitigate its effects.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-22
Advisory published
2026-07-14
Advisory updated
2026-07-22

Who should care

Administrators and users of Active Directory Domain Services should be aware of this vulnerability and take necessary precautions to mitigate its effects. This includes reviewing system logs and monitoring for potential exploitation attempts. Operators, platform administrators, and security teams should prioritize patching and compensating controls.

Technical summary

The vulnerability is caused by a null pointer dereference in Active Directory Domain Services. An authorized attacker can exploit this vulnerability to deny service over a network. The vulnerability has been analyzed and has a CVSS vector of CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H. The vulnerability affects Active Directory Domain Services, and defenders should focus on patching and monitoring.

Defensive priority

Medium

Recommended defensive actions

  • Apply patches or updates provided by the vendor
  • Implement compensating controls to mitigate the effects of the vulnerability
  • Monitor systems for suspicious activity
  • Conduct regular vulnerability assessments and penetration testing
  • Review relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The vulnerability is documented in the CVE record and the NVD detail page. The vendor has provided a patch and mitigation guidance. Evidence is limited, and defenders should verify affected scope and vendor guidance. Additional review of system logs and monitoring is recommended to detect potential exploitation attempts. The CVE record was published on 2026-07-14T17:17:11.120Z and was last modified on 2026-07-20T17:03:42.443Z. No additional information is available on the source item.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-57976 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-57976

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

  • CVE-2026-57976 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-57976

    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.