CVE-2025-20350

Cisco Desk Phone 9800 Series, IP Phone 7800 and 8800 Series, and Video Phone 8875 with SIP Firmware Denial of Service Vulnerability

State: Published
Severity: 7.5 High
Published: Oct 15, 2025
Updated: Oct 15, 2025
Reserved: Oct 10, 2024

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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 cause a DoS condition on an affected device.

This vulnerability is due to a buffer overflow when an affected device processes HTTP packets. An attacker could exploit this vulnerability by sending crafted HTTP input to the device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition. 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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	cisco

Weaknesses

CWE-121 Stack-based Buffer Overflow

Affected Products

Product	Versions
Cisco Session Initiation Protocol (SIP) SoftwareCisco	12.1(1)SR1Affected 11.5(1)Affected 10.3(2)Affected 10.2(2)Affected 10.3(1)Affected 10.3(1)SR4Affected 11.0(1)Affected 10.4(1)SR2 3rd PartyAffected 11.7(1)Affected 12.1(1)Affected 11.0(0.7) MPPAffected 9.3(4) 3rd PartyAffected 12.5(1)SR2Affected 10.2(1)SR1Affected 9.3(4)SR3 3rd PartyAffected 10.2(1)Affected 12.5(1)Affected 10.3(1)SR2Affected 11-0-1MSR1-1Affected 10.4(1) 3rd PartyAffected 12.5(1)SR1Affected 11.5(1)SR1Affected 10.1(1)SR2Affected 12.0(1)SR2Affected 12.6(1)Affected and 71 more versions

Product

Versions

Cisco Session Initiation Protocol (SIP) SoftwareCisco

12.1(1)SR1Affected
11.5(1)Affected
10.3(2)Affected
10.2(2)Affected
10.3(1)Affected
10.3(1)SR4Affected
11.0(1)Affected
10.4(1)SR2 3rd PartyAffected
11.7(1)Affected
12.1(1)Affected
11.0(0.7) MPPAffected
9.3(4) 3rd PartyAffected
12.5(1)SR2Affected
10.2(1)SR1Affected
9.3(4)SR3 3rd PartyAffected
10.2(1)Affected
12.5(1)Affected
10.3(1)SR2Affected
11-0-1MSR1-1Affected
10.4(1) 3rd PartyAffected
12.5(1)SR1Affected
11.5(1)SR1Affected
10.1(1)SR2Affected
12.0(1)SR2Affected
12.6(1)Affected
and 71 more versions

References

cisco-sa-phone-dos-FPyjLV7A

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