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CVE-2026-80077 Microsoft CVE debrief

CVE-2026-80077 debrief based on the supplied source corpus. The vulnerability is a heap-based buffer overflow in Remote Desktop Client, allowing unauthorized attackers to execute code over a network. Defenders should assess exposure and potential code execution risks. The CVE record and NVD entry provide details on this vulnerability, which has a CVSS score of 8.8 and is considered HIGH severity. The debrief aims to provide an executive overview of the vulnerability, its likely operational impact, and source-confidence limits.

Vendor
Microsoft
Product
Remote Desktop Client
CVSS
HIGH 8.8
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 Remote Desktop Client deployments, operators of Remote Desktop Client, platform administrators, vulnerability management teams, and security teams should assess exposure and potential code execution risks due to the heap-based buffer overflow. They should review and apply vendor advisories and patches for Remote Desktop Client, and verify exposure in their environment. Additionally, they may

Why it matters

Defenders should prioritize verifying exposure of Remote Desktop Client and assessing potential code execution risks due to the heap-based buffer overflow, which allows unauthorized attackers to execute code over a network.

  • Potential code execution over a network.
  • Unauthorized access to sensitive data.
  • Disruption of Remote Desktop Client services.
  • Elevation of privileges for attackers.

Technical summary

A heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to execute code over a network. The vulnerability has a CVSS score of 8.8 and is considered HIGH severity. The affected product is Remote Desktop Client, and defenders should prioritize verifying exposure and assessing potential code execution risks. The technical details of the vulnerability involve a buffer overflow that can be exploited by unauthorized attackers to execute code over a network.

Defensive priority

Defenders should prioritize verifying exposure of Remote Desktop Client and assessing potential code execution risks.

Recommended defensive actions

  • Verify exposure of Remote Desktop Client in your environment.
  • Assess potential code execution risks due to the heap-based buffer overflow.
  • Review and apply vendor advisories and patches for Remote Desktop Client.

Evidence notes

The CVE record and NVD entry provide details on a heap-based buffer overflow in Remote Desktop Client, allowing unauthorized attackers to execute code over a network.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-80077 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-80077

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

  • CVE-2026-80077 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-80077

    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.