Authenticated code execution via OCSP use-after-free
Published Jan 9, 2024 · Updated Jun 17, 2025
Use-after-free in Microsoft Windows Server OCSP processing allows remote authenticated users to execute code over a network. Microsoft identifies the flaw as CWE-416 but has not published the affected function, object-lifetime error, or crafted input that triggers reuse of freed memory. Exploitation requires high privileges and high-complexity conditions, and successful code execution can compromise confidentiality, integrity, and availability.
Summary
What happened
Use-after-free in Microsoft Windows Server OCSP processing allows remote authenticated users to execute code over a network. Microsoft identifies the flaw as CWE-416 but has not published the affected function, object-lifetime error, or crafted input that triggers reuse of freed memory. Exploitation requires high privileges and high-complexity conditions, and successful code execution can compromise confidentiality, integrity, and availability.
The record
- CVE
- CVE-2024-20655
- Published
- Jan 9, 2024
- Updated
- Jun 17, 2025
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-416, T1210
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jan 9, 2024CVE publishedPublication date reported by the CVE source.
- Jun 17, 2025Record 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=10.0.17763.0 <10.0.17763.5329
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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