CVE-2023-20073 — Rv340 Firmware
MEDIUMCVE-2023-20073 is a medium-severity (CVSS 5.3) Unrestricted File Upload vulnerability in cisco rv340 firmware. EPSS puts its 30-day exploitation probability at 90.1% (100th percentile). No vendor fix is recorded yet; mitigation options are listed below.
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…
Exploitation Status
No confirmed exploitation observed yet
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2023-20073.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2023-20073 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 388,997 CVEs with a current EPSS score, this one falls in the ≥ 90% band (highlighted). Counts from FIRST.org, log-scaled.
Description
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 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.
Affected Products
rv340 firmwareciscorv340w firmwareciscorv345 firmwareciscorv345p firmwareciscoDetection & mitigation playbook
Vendor / applianceDetect
Inventory every cisco rv340 firmware deployment and check each version against the affected-products list above.
Remediation status
No patch has shipped for CVE-2023-20073 yet — track the cisco rv340 firmware advisory for a fixed release and apply the workarounds below in the meantime.
Mitigate without a patch
Treat uploaded files as untrusted until proven otherwise: validate the actual content type rather than the supplied extension, store uploads outside the web root on a volume mounted without execute permission, and rename them to server-generated identifiers so an attacker cannot choose the path a request will later resolve. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.
How to detect CVE-2023-20073
A community-maintained Nuclei template exists for this CVE. You can scan for it directly:
nuclei -id cve-2023-20073 -u https://target- Template
- Cisco VPN Routers - Unauthenticated Arbitrary File Upload
- Severity
- critical
- Impact
- Successful exploitation of this vulnerability could lead to remote code execution or unauthorized access to sensitive information.
- Remediation
- Apply the latest security patches provided by Cisco to mitigate this vulnerability.
Template by ProjectDiscovery nuclei-templates (princechaddha, ritikchaddha), MIT licensed. View the full template. Scan only systems you are authorised to test.
Frequently Asked Questions
Is CVE-2023-20073 being exploited in your environment?
Detect and block the exploit chain at execution, on systems you cannot patch yet.