PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-80074 Microsoft CVE debrief

CVE-2026-80074 is a high-severity heap-based buffer overflow vulnerability in Remote Desktop Client, allowing unauthorized attackers to execute code over a network. This vulnerability requires immediate attention from defenders of Remote Desktop Client deployments. They should assess exposure, verify versions, and monitor for suspicious activity. The CVE Program and NVD records indicate a high severity vulnerability with potential code execution over a network. Defenders should review the official CVE Program and NVD records for detailed information.

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 of Remote Desktop Client deployments, including system administrators, security teams, and IT personnel, should assess exposure and verify versions. They should also monitor for suspicious Remote Desktop Client activity and review official advisories for detailed guidance. Additionally, operators and platform administrators should be aware of the potential impact and take necessary precautions to prevent or

Why it matters

CVE-2026-80074 is a high-severity vulnerability in Remote Desktop Client that allows code execution over a network. Defenders should assess exposure, verify versions, and monitor for suspicious activity.

  • Potential code execution over a network requires immediate verification of Remote Desktop Client versions
  • Exposure assessment is critical for deployments of affected versions

Technical summary

CVE-2026-80074 is a heap-based buffer overflow vulnerability in Remote Desktop Client. An unauthorized attacker can exploit this over a network to execute code. The vulnerability exists due to improper handling of input data, allowing attackers to execute arbitrary code. Official CVE Program and NVD records confirm this vulnerability, and defenders should review these sources for detailed technical information.

Defensive priority

High

Recommended defensive actions

  • Assess exposure of Remote Desktop Client deployments
  • Verify version 1.2.7279 or earlier is in use and consider upgrading
  • Monitor for suspicious Remote Desktop Client activity

Evidence notes

Official CVE Program and NVD records indicate 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-2026-80074 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-80074

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

  • CVE-2026-80074 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-80074

    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.