CVE-2023-21716
Published: 14 February 2023
Summary
CVE-2023-21716 is a critical-severity Integer Overflow or Wraparound (CWE-190) vulnerability in Microsoft Sharepoint Server. Its CVSS base score is 9.8 (Critical).
Operationally, ranked in the top 0.3% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
CVE-2023-21716 is a remote code execution vulnerability in Microsoft Word, carrying a CVSS 3.1 base score of 9.8 that reflects an integer overflow weakness (CWE-190) reachable over the network without authentication or user interaction. The flaw affects the Word application component and can result in complete loss of confidentiality, integrity, and availability on the target system.
An unauthenticated attacker positioned on the network can send a specially crafted document or request that triggers the flaw, allowing arbitrary code execution with the privileges of the Word process and full control over the affected host.
Microsoft security advisories published at the MSRC update guide for this CVE describe the available patches and urge customers to apply the fixes promptly to eliminate the exposure.
The associated EPSS score remains at a high level near 0.91 with no indicated rise from a low baseline.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-25883
Vulnerability details
Microsoft Word Remote Code Execution Vulnerability
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.