Remote code execution via PEAP heap overflow
Published Feb 14, 2023 · Updated Aug 19, 2026
Heap-based buffer overflow in Microsoft Windows PEAP allows remote attackers to execute code through a crafted PEAP packet. The PEAP request handler writes beyond a heap allocation while processing attacker-controlled authentication data; public records do not identify the affected function or faulty length calculation. Exploitation requires a reachable Windows PEAP endpoint configured to process the traffic and grants code execution in the PEAP process.
Summary
What happened
Heap-based buffer overflow in Microsoft Windows PEAP allows remote attackers to execute code through a crafted PEAP packet. The PEAP request handler writes beyond a heap allocation while processing attacker-controlled authentication data; public records do not identify the affected function or faulty length calculation. Exploitation requires a reachable Windows PEAP endpoint configured to process the traffic and grants code execution in the PEAP process.
The record
- CVE
- CVE-2023-21689
- Published
- Feb 14, 2023
- Updated
- Aug 19, 2026
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- CWE-122, T1210
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 14, 2023CVE publishedPublication date reported by the CVE source.
- Aug 19, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.10240.0 <10.0.10240.19747
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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