Authenticated code execution via unsafe deserialization
Published Aug 8, 2023 · Updated Aug 10, 2026
Deserialization in Microsoft Exchange Server 2016 CU23 and 2019 CU12/CU13 allows remote authenticated users to execute code. Microsoft identifies unsafe deserialization but has not disclosed the affected component, serialized data path, or type-validation failure. Exploitation requires low-privileged access from an adjacent network and grants control over Exchange data and service execution.
Summary
What happened
Deserialization in Microsoft Exchange Server 2016 CU23 and 2019 CU12/CU13 allows remote authenticated users to execute code. Microsoft identifies unsafe deserialization but has not disclosed the affected component, serialized data path, or type-validation failure. Exploitation requires low-privileged access from an adjacent network and grants control over Exchange data and service execution.
The record
- CVE
- CVE-2023-35388
- Published
- Aug 8, 2023
- Updated
- Aug 10, 2026
- Vendor
- Microsoft
- Product
- Microsoft Exchange Server 2019 Cumulative Update 12
- Classifications
- CWE-502, T1210
- Attack vector
- adjacent
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 8, 2023CVE publishedPublication date reported by the CVE source.
- Aug 10, 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=15.02.0 <15.02.1118.037
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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