Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NCVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.
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, exploitation aligns with the MITRE ATT&CK technique Data Obfuscation (T1001); ranked in the top 28% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
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 Data
Microsoft Protected Extensible Authentication Protocol (PEAP) Information Disclosure Vulnerability
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
Vulnerability scanning and recording can discover instances of out-of-bounds reads after code is deployed.
Routine patching replaces vulnerable code containing out-of-bounds read flaws.
Secure-development practices such as bounds checking and memory-safe languages directly prevent out-of-bounds reads.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.