CVE-2023-46263
Published: 19 December 2023
Summary
CVE-2023-46263 is a critical-severity Unrestricted Upload of File with Dangerous Type (CWE-434) vulnerability in Ivanti Avalanche. Its CVSS base score is 9.8 (Critical).
Operationally, ranked in the top 0.9% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
An unrestricted file upload vulnerability, tracked as CVE-2023-46263 and assigned CWE-434, affects Ivanti Avalanche versions 6.4.1 and earlier. The issue permits an attacker to upload files of dangerous types and carries a CVSS 3.1 base score of 9.8 reflecting network-accessible, unauthenticated exploitation that can result in full confidentiality, integrity, and availability impact.
Remote attackers without credentials can exploit the flaw over the network to upload and execute arbitrary code on the server, achieving remote code execution. No user interaction or special privileges are required.
Vendor release notes for Avalanche 6.4.2 indicate that the corrected version is available for download and should be applied to remediate the vulnerability. The current EPSS score of 0.7885 shows sustained high exploitation probability since disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-50490
Vulnerability details
An unrestricted upload of file with dangerous type vulnerability exists in Avalanche versions 6.4.1 and below that could allow an attacker to achieve a remote code execution.
- 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.
Requiring identifiable owners for portable devices reduces the attack surface for unrestricted uploads of dangerous file types via anonymous media.
Dangerous file uploads can be detonated in the chamber to determine malice before any production write or execution occurs.
Prevents unrestricted writing of arbitrary or malicious firmware by keeping hardware write-protect enabled except under tightly controlled manual procedures.
Scans files from external sources on download/open/execute, blocking unrestricted uploads of dangerous file types.