CVE-2019-1763: Cisco IP Phone 8800 Series Authorization Bypass Vulnerability

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-03-22 · updated 2026-06-17
Weakness: CWE-284

Description

A vulnerability in the web-based management interface of Session Initiation Protocol (SIP) Software for Cisco IP Phone 8800 Series could allow an unauthenticated, remote attacker to bypass authorization, access critical services, and cause a denial of service (DoS) condition. The vulnerability exists because the software fails to sanitize URLs before it handles requests. An attacker could exploit this vulnerability by submitting a crafted URL. A successful exploit could allow the attacker to gain unauthorized access to critical services and cause a DoS condition. This vulnerability affects Cisco IP Phone 8800 Series products running a SIP Software release prior to 11.0(5) for Wireless IP Phone 8821 and 8821-EX; and 12.5(1)SR1 for the IP Conference Phone 8832 and the rest of the IP Phone 8800 Series. Cisco IP Conference Phone 8831 is not affected.

Affected products

Cisco Ip Conference Phone 8832 Firmware: before 12.5\(1\)sr1 — fixed in 12.5\(1\)sr1
Cisco Ip Phone 8800 Firmware: before 12.5\(1\)sr1 — fixed in 12.5\(1\)sr1
Cisco Ip Phone 8821-Ex Firmware: before 11.0\(5\) — fixed in 11.0\(5\)
Cisco Ip Phone 8821 Firmware: before 11.0\(5\) — fixed in 11.0\(5\)

How to fix

Upgrade to a fixed version: Cisco Ip Conference Phone 8832 Firmware 12.5\(1\)sr1; Cisco Ip Phone 8800 Firmware 12.5\(1\)sr1; Cisco Ip Phone 8821-Ex Firmware 11.0\(5\); Cisco Ip Phone 8821 Firmware 11.0\(5\). Check the vendor advisory for mitigations.

References

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