CVE-2023-33299
Published: 23 June 2023
Summary
CVE-2023-33299 is a critical-severity Deserialization of Untrusted Data (CWE-502) vulnerability in Fortinet Fortinac. Its CVSS base score is 9.8 (Critical).
Operationally, ranked in the top 6.4% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
CVE-2023-33299 is a deserialization of untrusted data vulnerability (CWE-502) affecting Fortinet FortiNAC in all versions below 7.2.1, below 9.4.3, below 9.2.8, and all earlier 8.x releases. The flaw resides in the inter-server communication port and permits remote attackers to supply crafted serialized payloads that the application deserializes without validation.
An unauthenticated network attacker can exploit the issue by sending a malicious request to the exposed inter-server port, resulting in arbitrary code execution with full system privileges. The CVSS 3.1 score of 9.8 reflects the absence of required credentials, user interaction, or network-adjacent access.
The vendor advisory FG-IR-23-074 states that FortiNAC 8.x branches will receive no fixes; customers must upgrade to a supported release (7.2.1 or later, 9.2.8 or later, or 9.4.3 or later) to eliminate the exposure. The associated EPSS score has remained flat at its peak value of 0.1091 with no material upward trajectory after disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-37462
Vulnerability details
A deserialization of untrusted data in Fortinet FortiNAC below 7.2.1, below 9.4.3, below 9.2.8 and all earlier versions of 8.x allows attacker to execute unauthorized code or commands via specifically crafted request on inter-server communication port. Note FortiNAC versions 8.x…
more
will not be fixed.
- 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.