CVE-2023-36757
Published: 12 September 2023
Summary
CVE-2023-36757 is a high-severity Deserialization of Untrusted Data (CWE-502) vulnerability in Microsoft Exchange Server. Its CVSS base score is 8.0 (High).
Operationally, ranked at the 49.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
Deeper analysis
Microsoft Exchange Server is affected by a spoofing vulnerability tracked as CVE-2023-36757. The flaw carries a CVSS 3.1 score of 8.0 and is associated with CWE-502, indicating that an adjacent-network attacker with low privileges can supply crafted data that the server processes without adequate validation.
An attacker positioned on the same network segment can exploit the issue without user interaction to spoof identity or data, resulting in high impacts to confidentiality, integrity, and availability on the Exchange Server.
Microsoft has published remediation guidance in its Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-36757.
The EPSS score for this CVE rose materially from a low baseline to a peak of 0.0802 on 2025-01-22 before receding, indicating that exploitation interest emerged after disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-40700
Vulnerability details
Microsoft Exchange Server Spoofing Vulnerability
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Penetration testing supplies malicious serialized objects, detecting unsafe deserialization and supporting corrective actions.
Evaluation of untrusted data handling (deserialization testing) reveals unsafe processing, which the required remediation process addresses.
Untrusted serialized data can be deserialized and observed inside the chamber, blocking gadget-chain exploitation outside the sandbox.
Validates or rejects untrusted serialized data before deserialization occurs.
Identifies and blocks malicious code introduced through deserialization of untrusted data at system boundaries.
Integrity verification of serialized information can detect tampering before deserialization occurs.
Provenance of associated data allows detection of untrusted sources before deserialization or processing occurs.