Cisco Small Business RV016, RV042, RV042G, RV082 , RV320, and RV325 Routers Cross-Site Scripting Vulnerabilities

Vulnerability

Multiple cross-site scripting (XSS) vulnerabilities exist in the web-based management interface of Cisco Small Business RV016, RV042, RV042G, RV082, RV320, and RV325 routers. The vulnerabilities are due to insufficient input validation by the interface. All firmware versions are affected, and Cisco has not released software updates to address them.

Exploitation

An unauthenticated, remote attacker can exploit these vulnerabilities by sending crafted HTTP requests to an affected device and then persuading a user of the interface to visit specific web pages that include malicious payloads. The attacker requires no prior authentication but relies on user interaction (following a crafted link or visiting a malicious page).

Impact

Successful exploitation allows the attacker to execute arbitrary script code in the context of the affected web-based management interface or access sensitive, browser-based information. This could lead to session hijacking, credential theft, or other malicious actions performed in the context of the logged-in user.

Mitigation

Cisco has not released software updates that address these vulnerabilities. No workarounds exist, but mitigations can reduce exposure. For RV320 and RV325 routers, disable remote management. For RV016, RV042, RV042G, and RV082 routers, disable remote management and block access to ports 443 and 60443 from the WAN interface. Detailed steps are provided in the Cisco Security Advisory [1]. These mitigations are not fixes; the devices remain vulnerable to attacks originating from the LAN side.