Authenticated code execution via unsafe deserialization
Published Jul 11, 2023 · Updated Feb 28, 2025
Deserialization of untrusted data in Microsoft SharePoint Server allows remote authenticated users to execute code over the network. Microsoft has not published the affected deserialization sink, the input field carrying serialized data, or the operation that accepts it. A low-privileged account can reach the flaw without user interaction, and successful exploitation runs attacker-controlled code on the server.
Summary
What happened
Deserialization of untrusted data in Microsoft SharePoint Server allows remote authenticated users to execute code over the network. Microsoft has not published the affected deserialization sink, the input field carrying serialized data, or the operation that accepts it. A low-privileged account can reach the flaw without user interaction, and successful exploitation runs attacker-controlled code on the server.
The record
- CVE
- CVE-2023-33134
- Published
- Jul 11, 2023
- Updated
- Feb 28, 2025
- Vendor
- Microsoft
- Product
- Microsoft SharePoint Enterprise Server 2016
- Classifications
- CWE-502, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 11, 2023CVE publishedPublication date reported by the CVE source.
- Feb 28, 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=16.0.0 <16.0.5404.1000
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.
Weakness, pattern, technique
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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