Authenticated spoofing
Published Sep 12, 2023 · Updated Oct 30, 2025
Deserialization of untrusted data in Microsoft Exchange Server allows remote authenticated users to conduct spoofing over adjacent networks. Microsoft has not disclosed the affected component, serialized input, or unsafe operation that enables the spoofing behavior. Exploitation requires low-privileged authentication and adjacent-network reachability; the public record does not identify which Exchange artifact can be forged.
Summary
What happened
Deserialization of untrusted data in Microsoft Exchange Server allows remote authenticated users to conduct spoofing over adjacent networks. Microsoft has not disclosed the affected component, serialized input, or unsafe operation that enables the spoofing behavior. Exploitation requires low-privileged authentication and adjacent-network reachability; the public record does not identify which Exchange artifact can be forged.
The record
- CVE
- CVE-2023-36757
- Published
- Sep 12, 2023
- Updated
- Oct 30, 2025
- Vendor
- Microsoft
- Product
- Microsoft Exchange Server 2019 Cumulative Update 12
- Classifications
- CWE-502
- Attack vector
- adjacent
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 12, 2023CVE publishedPublication date reported by the CVE source.
- Oct 30, 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=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.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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