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

Vulnerability

The web-based management interface of Cisco Small Business RV016, RV042, RV042G, RV082, RV320, and RV325 routers contains multiple cross-site scripting (XSS) vulnerabilities due to insufficient input validation. An unauthenticated remote attacker can exploit these flaws by sending crafted HTTP requests to an affected device. No software updates have been released by Cisco as of the publication date.

Exploitation

An attacker must have network access to the device's web-based management interface (typically exposed on ports 443 or 60443 for remote management). The attacker sends specially crafted HTTP requests containing malicious payloads. The attacker then persuades a user—such as an administrator—to visit specific web pages that include the payloads, often through social engineering or by embedding the link in a phishing email.

Impact

Successful exploitation allows the attacker to execute arbitrary script code in the context of the affected interface. This can lead to the disclosure of sensitive browser-based information, such as session tokens, cookies, or other data accessible within the web interface. The attacker does not gain direct administrative control but can perform actions on behalf of the victim user within the interface.

Mitigation

Cisco has not released software updates to address these vulnerabilities. As a workaround, administrators should disable remote management on all affected models. For RV320 and RV325 routers, disabling remote management is sufficient. For RV016, RV042, RV042G, and RV082 routers, additionally block access to ports 443 and 60443 on the WAN interface. Detailed steps are provided in the Cisco Security Advisory [1]. No other workarounds are available.