CVE-2025-20335
moderate-risk
Published 2025-09-03
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.
Do I need to act?
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0.04% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.3/10
Medium
NETWORK
/ LOW complexity
Affected Products (20)
Desk Phone 9841 Firmware
Desk Phone 9851 Firmware
Desk Phone 9861 Firmware
Desk Phone 9871 Firmware
Ip Phone 7811 Firmware
Ip Phone 7811 Firmware
Ip Phone 7811 Firmware
Ip Phone 7821 Firmware
Ip Phone 7821 Firmware
Ip Phone 7821 Firmware
Ip Phone 7841 Firmware
Ip Phone 7841 Firmware
Ip Phone 7841 Firmware
Ip Phone 7861 Firmware
Ip Phone 7861 Firmware
Ip Phone 7861 Firmware
Affected Vendors
References (1)
46
/ 100
moderate-risk
Severity
21/34 · High
Exploitability
0/34 · Minimal
Exposure
25/34 · High