CVE-2023-21691
Published: 14 February 2023
Summary
CVE-2023-21691 is a high-severity Out-of-bounds Read (CWE-125) vulnerability in Microsoft Windows 10 1809. Its CVSS base score is 7.5 (High).
Operationally, ranked in the top 10.5% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
Microsoft Protected Extensible Authentication Protocol (PEAP) contains an information disclosure vulnerability tracked as CVE-2023-21691. The flaw is rated 7.5 under CVSS 3.1 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N) and is associated with CWE-125. It affects the PEAP implementation in Microsoft products and permits unauthorized exposure of sensitive data over a network.
An unauthenticated remote attacker can exploit the issue without user interaction to obtain confidential information from the affected component. The attack requires only network access and succeeds because of insufficient bounds checking during PEAP processing.
Microsoft has published remediation guidance and patch availability for the vulnerability in its Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21691. The current EPSS score of 0.0459 with a recorded peak of 0.0510 indicates limited observed exploitation interest since disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-25858
Vulnerability details
Microsoft Protected Extensible Authentication Protocol (PEAP) Information Disclosure 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.