CVE-2023-21689
CWE-122Published: February 14, 2023· Updated: Jun 17, 2026
Official Description
Microsoft Protected Extensible Authentication Protocol (PEAP) Remote Code Execution Vulnerability
Risk Analysis
This vulnerability in Microsoft Protected Extensible Authentication Protocol (PEAP) allows for remote code execution. Given the critical CVSS score of 9.8 and the lack of required user interaction or privileges, this flaw presents a severe risk to system integrity and availability.
There is no known public exploit for this vulnerability, and it is not currently listed in the CISA KEV catalog. It is remotely exploitable due to the network-based attack vector.
Apply the latest security updates provided by Microsoft for the affected Windows versions.
Technical Analysis
CVE-2023-21689 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
Official Patches & Advisories
All References (2)
Quick Facts
Related CVEs (CWE-122)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2023-21689 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts