Improper access control in Cisco Systems, Inc products - CVE-2025-20335
Published: September 4, 2025
Vulnerability identifier: #VU114782
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-20335
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to a lack of proper authentication controls in the directory permissions. A remote attacker can send a specially crafted request and write arbitrary files on the target device.
Affected software
Desk Phone 9800 Series
Cisco IP Phone 8800 Series
Video Phone 8875
IP Phone 7800 Series
SIP IP Phone Software
Cisco IP Phone 8800 Series
Video Phone 8875
IP Phone 7800 Series
SIP IP Phone Software
How to mitigate CVE-2025-20335
Install updates from vendor's website.
SIP IP Phone Software - addressed in versions 3.3(1), 11.0(6)SR7, 14.3(1)SR2