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TI-2021-19684 Aliases CVE-2021-43905GHSA-p5c8-x5qh-v2mv

Microsoft Office app Remote Code Execution Vulnerability

Priority MEDIUM 48Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

Microsoft Office app Remote Code Execution Vulnerability

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.03089 87th percentileScored 2026-11-07
Fix Fixed Office app (Microsoft): publication

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftOffice appbefore publicationpublicationPatch availableCNA
  • Office app VendorMicrosoft Affected before publication Fixed in publication Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:365_copilot:*:*:*:*:*:*:*:*before 18.2110.13110.0VulnerableMicrosoft
  • cpe:2.3:a:microsoft:365_copilot:*:*:*:*:*:*:*:* Versions before 18.2110.13110.0 Vulnerable ·Microsoft

Remediation

  • Fix · CNA Office app (Microsoft) Fixed in publication

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-43905
  2. 2026-10-03 Alias added: GHSA-p5c8-x5qh-v2mv

References

Patch 1

  • TI-2025-37796 GDI+ Remote Code Execution Vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2025-23775 M365 Copilot Information Disclosure Vulnerability CVSS 3.1CRITICAL 9.3
  • TI-2025-33667 GDI+ Remote Code Execution Vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2026-37251 Microsoft M365 Copilot Remote Code Execution Vulnerability CVSS 3.1CRITICAL 9.9
  • TI-2026-39054 M365 Copilot Information Disclosure Vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2026-58846 Microsoft 365 Copilot Elevation of Privilege Vulnerability CVSS 3.1CRITICAL 9.9
See all 54 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences