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CVE-2025-20351— Cisco Desk Phone 9800 Series, IP Phone 7800 and 8800 Series, and Video Phone 8875 with SIP Firmware Cross-Site Scripting Vulnerability

Quick assessment

Affected
Cisco Cisco Session Initiation Protocol (SIP) Software
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cisco SIP Software是美国思科（Cisco）公司的一个SIP协议软件系统。 Cisco SIP Software存在跨站脚本漏洞，该漏洞源于web UI未充分验证用户输入，可能导致跨站脚本攻击。

CVSS 6.1 · Medium EPSS 0.29% · P19
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I. Basic Information for CVE-2025-20351

Vulnerability Information
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Vulnerability Title
Cisco Desk Phone 9800 Series, IP Phone 7800 and 8800 Series, and Video Phone 8875 with SIP Firmware Cross-Site Scripting Vulnerability
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco SIP Software 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco SIP Software是美国思科（Cisco）公司的一个SIP协议软件系统。 Cisco SIP Software存在跨站脚本漏洞，该漏洞源于web UI未充分验证用户输入，可能导致跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Cisco Cisco Session Initiation Protocol (SIP) Software 12.1(1)SR1 -

II. Public POCs for CVE-2025-20351

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III. Intelligence Information for CVE-2025-20351

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Same Patch Batch · Cisco · 2025-10-15 · 5 CVEs total

CVE-2025-20350 7.5 HIGH Cisco Desk Phone 9800 Series, IP Phone 7800 and 8800 Series, and Video Phone 8875 with SIP
CVE-2025-20359 6.5 MEDIUM Multiple Cisco Products Snort 3 MIME Information Disclosure or Denial of Service Vulnerabi
CVE-2025-20360 5.8 MEDIUM Multiple Cisco Products Snort 3 MIME Denial of Service Vulnerability
CVE-2025-20329 4.9 MEDIUM Cisco TelePresence Collaboration Endpoint and RoomOS Software Information Disclosure Vulne

IV. Related Vulnerabilities

Same product: Cisco Session Initiation Protocol (SIP) Software
Same vendor: Cisco
Same weakness: CWE-79

V. Comments for CVE-2025-20351

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