CVE-2023-20265

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-11-21 · updated 2026-06-17
Weakness: CWE-79

Description

A vulnerability in the web-based management interface of a small subset of Cisco IP Phones could allow an authenticated, remote attacker to conduct a stored cross-site scripting (XSS) attack against a user of the interface on an affected device. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by persuading a user of an affected interface to view a page containing malicious HTML or script content. 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. To exploit this vulnerability, the attacker must have valid credentials to access the web-based management interface of the affected device.

Affected products

Cisco Ip Dect 110 Firmware: before 5.1.2sr1 — fixed in 5.1.2sr1
Cisco Ip Dect 210 Firmware: before 5.1.2sr1 — fixed in 5.1.2sr1
Cisco Unified Ip Phone 6901 Firmware: from 9.0 before 9.3\(1\)sr3 — fixed in 9.3\(1\)sr3
Cisco Unified Sip Phone 3905 Firmware: from 9.0 before 9.4\(1\)sr4 — fixed in 9.4\(1\)sr4

How to fix

Upgrade to a fixed version: Cisco Ip Dect 110 Firmware 5.1.2sr1; Cisco Ip Dect 210 Firmware 5.1.2sr1; Cisco Unified Ip Phone 6901 Firmware 9.3\(1\)sr3; Cisco Unified Sip Phone 3905 Firmware 9.4\(1\)sr4. Check the vendor advisory for mitigations.

References

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