CVE-2023-33160
Published: 11 July 2023
Summary
CVE-2023-33160 is a high-severity Deserialization of Untrusted Data (CWE-502) vulnerability in Microsoft Sharepoint Server. Its CVSS base score is 8.8 (High).
Operationally, ranked in the top 6.0% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
CVE-2023-33160 is a remote code execution vulnerability in Microsoft SharePoint Server, carrying a CVSS 3.1 base score of 8.8 and mapped to CWE-502 for deserialization of untrusted data. The flaw affects SharePoint Server instances reachable over the network and enables an authenticated attacker to execute arbitrary code on the server.
An attacker with low privileges can exploit the issue remotely with low attack complexity and no user interaction, resulting in complete loss of confidentiality, integrity, and availability on the affected server. The published EPSS score remains flat at 0.1237 with no material increase after disclosure.
Microsoft’s Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-33160 supplies official guidance on available patches and mitigation steps for supported SharePoint Server versions.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-37345
Vulnerability details
Microsoft SharePoint Server Remote Code Execution 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.