CVE-2025-20335
5.3 · MEDIUMOverview
CVE-2025-20335 is a medium-severity vulnerability affecting cisco desk_phone_9841_firmware. It was published on September 3, 2025 and has a CVSS 3.1 base score of 5.3 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 5.3, 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 directory permissions of Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 could allow an unauthenticated, remote attacker to write arbitrary files on an affected device.
This vulnerability is due to a lack of proper authentication controls. An attacker could exploit this vulnerability by sending a crafted request to an affected device. A successful exploit could allow the attacker to perform arbitrary file writes to specific directories in the underlying operating system.
Note: To exploit this vulnerability, Web Access must be enabled on the phone. Web Access is disabled by default.
Remediation
Check the references section for vendor advisories and patches from cisco. Update desk_phone_9841_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_9841_firmware | >= 3.0\(1\), < 3.3\(1\) | Affected |
| cisco | desk_phone_9851_firmware | >= 3.0\(1\), < 3.3\(1\) | Affected |
| cisco | desk_phone_9861_firmware | >= 3.0\(1\), < 3.3\(1\) | Affected |
| cisco | desk_phone_9871_firmware | >= 3.0\(1\), < 3.3\(1\) | 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 |
| cisco | ip_phone_8841_firmware | >= 0, < 14.3\(1\) | Affected |
Frequently Asked Questions
What is CVE-2025-20335?
CVE-2025-20335 is a medium-severity vulnerability affecting cisco desk_phone_9841_firmware. It was published on September 3, 2025 and has a CVSS 3.1 base score of 5.3 (MEDIUM).
How severe is CVE-2025-20335?
This vulnerability has a CVSS 3.1 base score of 5.3, 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-2025-20335?
Check the references section for vendor advisories and patches from cisco. Update desk_phone_9841_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-2025-20335?
CyberStrike's AI-powered security agents can automatically detect CVE-2025-20335 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.
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