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. These flaws stem from insufficient input validation by the interface, enabling an attacker to inject malicious script code. The affected firmware versions are those prior to any fix, as Cisco has not released software updates that address these vulnerabilities [1].

Exploitation

An unauthenticated, remote attacker can exploit these vulnerabilities by sending crafted HTTP requests to an affected device. The attacker must then persuade a user—typically an administrator—to visit specific web pages that include the malicious payloads. This may be achieved through social engineering or by luring the user to a crafted link while they are logged into the router's management interface [1].

Impact

A successful exploit allows the attacker to execute arbitrary script code in the context of the affected web-based management interface. Alternatively, the attacker could access sensitive, browser-based information such as session tokens or credentials, potentially leading to further compromise of the router or associated network resources [1].

Mitigation

Cisco has not released software updates to fix these vulnerabilities. As a workaround, 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]. No other workarounds exist; the devices remain accessible via the LAN interface after applying these mitigations.