CVE-2025-20351
6.1 · MEDIUMOverview
CVE-2025-20351 is a medium-severity vulnerability affecting cisco desk_phone_9871_firmware. It was published on October 15, 2025 and has a CVSS 3.1 base score of 6.1 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 6.1, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
A vulnerability in the web UI of Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 running Cisco SIP Software could allow an unauthenticated, remote attacker to conduct XSS attacks against a user of the web UI.
This vulnerability exists because the web UI of an affected device does not sufficiently validate user-supplied input. An attacker could exploit this vulnerability by persuading a user to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information.
Note: To exploit this vulnerability, the phone must be registered to Cisco Unified Communications Manager and have Web Access enabled. Web Access is disabled by default.
Remediation
Check the references section for vendor advisories and patches from cisco. Update desk_phone_9871_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| cisco | desk_phone_9871_firmware | 3.0\(1\) | Affected |
| cisco | desk_phone_9841_firmware | 3.0\(1\) | Affected |
| cisco | desk_phone_9851_firmware | 3.0\(1\) | Affected |
| cisco | desk_phone_9861_firmware | 3.0\(1\) | Affected |
| cisco | ip_phone_8865_firmware | >= 0, < 14.3\(1\) | Affected |
| cisco | ip_phone_7811_firmware | >= 0, < 14.3\(1\) | Affected |
| cisco | ip_phone_7821_firmware | >= 0, < 14.3\(1\) | Affected |
| cisco | ip_phone_7841_firmware | >= 0, < 14.3\(1\) | Affected |
| cisco | ip_phone_7861_firmware | >= 0, < 14.3\(1\) | Affected |
| cisco | ip_phone_8811_firmware | >= 0, < 14.3\(1\) | Affected |
Frequently Asked Questions
What is CVE-2025-20351?
CVE-2025-20351 is a medium-severity vulnerability affecting cisco desk_phone_9871_firmware. It was published on October 15, 2025 and has a CVSS 3.1 base score of 6.1 (MEDIUM).
How severe is CVE-2025-20351?
This vulnerability has a CVSS 3.1 base score of 6.1, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2025-20351?
Check the references section for vendor advisories and patches from cisco. Update desk_phone_9871_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2025-20351?
CyberStrike's AI-powered security agents can automatically detect CVE-2025-20351 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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Browser-based exploitation validates findings with real proof-of-concept.
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