CVE-2023-20073
Published: 05 April 2023
Summary
CVE-2023-20073 is a medium-severity Unrestricted Upload of File with Dangerous Type (CWE-434) vulnerability in Cisco Rv340 Firmware. Its CVSS base score is 5.3 (Medium).
Operationally, ranked in the top 0.3% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
A vulnerability in the web-based management interface of Cisco RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers allows unauthenticated remote attackers to upload arbitrary files. The issue stems from insufficient authorization enforcement on file-upload functionality and is tracked as CWE-434 with a CVSS 3.1 base score of 5.3.
An attacker can exploit the flaw by sending a crafted HTTP request to an affected device, resulting in the ability to place arbitrary files on the router without authentication.
The official Cisco Security Advisory cisco-sa-sb-rv-afu-EXxwA65V details the affected models and provides mitigation guidance, including available software updates.
The EPSS score for this CVE has remained stable near 0.91 since disclosure, indicating sustained but not newly emerging exploitation interest.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-24252
Vulnerability details
A vulnerability in the web-based management interface of Cisco RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers could allow an unauthenticated, remote attacker to upload arbitrary files to an affected device. This vulnerability is due to insufficient authorization…
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enforcement mechanisms in the context of file uploads. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to upload arbitrary files to the affected device.
- 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.