Cisco has published a security advisory that states that they have discovered two vulnerabilities, an XSS and an HTML injection vulnerability.
These vulnerabilities existed in the SPA500 series of the Cisco Small Business IP Phones.
CVE-2023-20181: XSS Vulnerability
This vulnerability exists due to insufficient validation of user-supplied input in the web-based management interface of Cisco Small Business SPA500 Series IP Phones that an attacker can exploit, creating a crafted link resulting in arbitrary script execution on the interface.
The CVSS Score for this vulnerability is given as 6.1 (Medium)
CVE-2023-20218: HTML Injection Vulnerability
This is an HTML injection vulnerability that exists due to insufficient sanitization of user-supplied inputs in the web-based management interface of the Cisco Small Business SPA500 Series IP Phones that can be exploited by a threat actor by creating a crafted link resulting in potential alteration in the web page and redirect the user to malicious websites.
Furthermore, this can also be used to conduct other client-side attacks. The CVSS Score for this vulnerability is given as 5.8(Medium)
Cisco confirmed that there had been no workarounds for fixing these vulnerabilities. In addition to this, Cisco mentioned that they wouldn’t be releasing security patches for these vulnerabilities as the Cisco Small Business SPA500 Series IP Phones reached the end-of-life process on August 13, 2018.
Users of these products are recommended to switch to other alternative Cisco products to avoid these vulnerabilities.