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

Summary

CVE	CVE-2025-20350
State	PUBLISHED
Assigner	cisco
Source Priority	CVE Program / NVD first with legacy fallback
Published	2025-10-15 17:15:48 UTC
Updated	2026-10-08 11:10:00 UTC
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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-121 | CWE-121 Stack-based Buffer Overflow

Version	Source	Type	Score	Severity	Vector
3.1	[email protected]	Secondary	7.5	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`
3.1	CNA	CVSSV3_1	7.5	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`

CVSS v3.1 Breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

Type	Vendor	Product	Version	Update	Edition	Language
Hardware	Cisco	Desk Phone 9841	-	All	All	All
Operating System	Cisco	Desk Phone 9841 Firmware	All	All	All	All
Hardware	Cisco	Desk Phone 9851	-	All	All	All
Operating System	Cisco	Desk Phone 9851 Firmware	All	All	All	All
Hardware	Cisco	Desk Phone 9861	-	All	All	All
Operating System	Cisco	Desk Phone 9861 Firmware	All	All	All	All
Hardware	Cisco	Desk Phone 9871	-	All	All	All
Operating System	Cisco	Desk Phone 9871 Firmware	All	All	All	All
Hardware	Cisco	Ip Phone 7811	-	All	All	All
Operating System	Cisco	Ip Phone 7811 Firmware	All	All	All	All
Operating System	Cisco	Ip Phone 7811 Firmware	14.3\(1\)	All	All	All
Operating System	Cisco	Ip Phone 7811 Firmware	14.3\(1\)	sr1	All	All
Hardware	Cisco	Ip Phone 7821	-	All	All	All
Operating System	Cisco	Ip Phone 7821 Firmware	All	All	All	All
Operating System	Cisco	Ip Phone 7821 Firmware	14.3\(1\)	All	All	All
Operating System	Cisco	Ip Phone 7821 Firmware	14.3\(1\)	sr1	All	All
Hardware	Cisco	Ip Phone 7841	-	All	All	All
Operating System	Cisco	Ip Phone 7841 Firmware	All	All	All	All
Operating System	Cisco	Ip Phone 7841 Firmware	14.3\(1\)	All	All	All
Operating System	Cisco	Ip Phone 7841 Firmware	14.3\(1\)	sr1	All	All
Hardware	Cisco	Ip Phone 7861	-	All	All	All
Operating System	Cisco	Ip Phone 7861 Firmware	All	All	All	All
Operating System	Cisco	Ip Phone 7861 Firmware	14.3\(1\)	All	All	All
Operating System	Cisco	Ip Phone 7861 Firmware	14.3\(1\)	sr1	All	All
Hardware	Cisco	Ip Phone 8811	-	All	All	All
Operating System	Cisco	Ip Phone 8811 Firmware	All	All	All	All
Operating System	Cisco	Ip Phone 8811 Firmware	14.3\(1\)	All	All	All
Operating System	Cisco	Ip Phone 8811 Firmware	14.3\(1\)	sr1	All	All
Hardware	Cisco	Ip Phone 8821	-	All	All	All
Operating System	Cisco	Ip Phone 8821 Firmware	All	All	All	All
Operating System	Cisco	Ip Phone 8821 Firmware	11.0\(0.7\)	mpp	All	All
Operating System	Cisco	Ip Phone 8821 Firmware	11.0\(1\)	All	All	All
Operating System	Cisco	Ip Phone 8821 Firmware	11.0\(2\)	All	All	All
Operating System	Cisco	Ip Phone 8821 Firmware	11.0\(2\)	sr1	All	All
Operating System	Cisco	Ip Phone 8821 Firmware	11.0\(2\)	sr2	All	All
Operating System	Cisco	Ip Phone 8821 Firmware	11.0\(3\)	All	All	All
Operating System	Cisco	Ip Phone 8821 Firmware	11.0\(3\)	sr1	All	All
Operating System	Cisco	Ip Phone 8821 Firmware	11.0\(3\)	sr2	All	All
Operating System	Cisco	Ip Phone 8821 Firmware	11.0\(3\)	sr3	All	All
Operating System	Cisco	Ip Phone 8821 Firmware	11.0\(3\)	sr4	All	All
Operating System	Cisco	Ip Phone 8821 Firmware	11.0\(3\)	sr5	All	All
Operating System	Cisco	Ip Phone 8821 Firmware	11.0\(3\)	sr6	All	All
Operating System	Cisco	Ip Phone 8821 Firmware	11.0\(4\)	All	All	All
Operating System	Cisco	Ip Phone 8821 Firmware	11.0\(4\)	sr1	All	All
Operating System	Cisco	Ip Phone 8821 Firmware	11.0\(4\)	sr2	All	All
Operating System	Cisco	Ip Phone 8821 Firmware	11.0\(4\)	sr3	All	All
Operating System	Cisco	Ip Phone 8821 Firmware	11.0\(5\)	All	All	All
Operating System	Cisco	Ip Phone 8821 Firmware	11.0\(5\)	sr1	All	All
Operating System	Cisco	Ip Phone 8821 Firmware	11.0\(5\)	sr2	All	All
Operating System	Cisco	Ip Phone 8821 Firmware	11.0\(5\)	sr3	All	All
Operating System	Cisco	Ip Phone 8821 Firmware	11.0\(6\)	All	All	All
Operating System	Cisco	Ip Phone 8821 Firmware	11.0\(6\)	sr1	All	All
Operating System	Cisco	Ip Phone 8821 Firmware	11.0\(6\)	sr2	All	All
Operating System	Cisco	Ip Phone 8821 Firmware	11.0\(6\)	sr4	All	All
Operating System	Cisco	Ip Phone 8821 Firmware	11.0\(6\)	sr5	All	All
Operating System	Cisco	Ip Phone 8821 Firmware	11.0\(6\)	sr6	All	All
Hardware	Cisco	Ip Phone 8832	-	All	All	All
Operating System	Cisco	Ip Phone 8832 Firmware	All	All	All	All
Operating System	Cisco	Ip Phone 8832 Firmware	14.3\(1\)	All	All	All
Operating System	Cisco	Ip Phone 8832 Firmware	14.3\(1\)	sr1	All	All
Hardware	Cisco	Ip Phone 8841	-	All	All	All
Operating System	Cisco	Ip Phone 8841 Firmware	All	All	All	All
Operating System	Cisco	Ip Phone 8841 Firmware	14.3\(1\)	All	All	All
Operating System	Cisco	Ip Phone 8841 Firmware	14.3\(1\)	sr1	All	All
Hardware	Cisco	Ip Phone 8845	-	All	All	All
Operating System	Cisco	Ip Phone 8845 Firmware	All	All	All	All
Operating System	Cisco	Ip Phone 8845 Firmware	14.3\(1\)	All	All	All
Operating System	Cisco	Ip Phone 8845 Firmware	14.3\(1\)	sr1	All	All
Hardware	Cisco	Ip Phone 8851	-	All	All	All
Operating System	Cisco	Ip Phone 8851 Firmware	All	All	All	All
Operating System	Cisco	Ip Phone 8851 Firmware	14.3\(1\)	All	All	All
Operating System	Cisco	Ip Phone 8851 Firmware	14.3\(1\)	sr1	All	All
Hardware	Cisco	Ip Phone 8861	-	All	All	All
Operating System	Cisco	Ip Phone 8861 Firmware	All	All	All	All
Operating System	Cisco	Ip Phone 8861 Firmware	14.3\(1\)	All	All	All
Operating System	Cisco	Ip Phone 8861 Firmware	14.3\(1\)	sr1	All	All
Hardware	Cisco	Ip Phone 8865	-	All	All	All
Operating System	Cisco	Ip Phone 8865 Firmware	All	All	All	All
Operating System	Cisco	Ip Phone 8865 Firmware	14.3\(1\)	All	All	All
Operating System	Cisco	Ip Phone 8865 Firmware	14.3\(1\)	sr1	All	All
Hardware	Cisco	Video Phone 8875	-	All	All	All
Operating System	Cisco	Video Phone 8875 Firmware	All	All	All	All
Operating System	Cisco	Video Phone 8875 Firmware	2.3\(1\)	All	All	All
Operating System	Cisco	Video Phone 8875 Firmware	2.3\(1\)	sr1	All	All
Operating System	Cisco	Video Phone 8875 Firmware	All	All	All	All

Vendor Declared Affected Products

Source	Vendor	Product	Version	Platforms
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 12.1(1)SR1	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 11.5(1)	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 10.3(2)	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 10.2(2)	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 10.3(1)	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 10.3(1)SR4	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 11.0(1)	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 10.4(1)SR2 3rd Party	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 11.7(1)	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 12.1(1)	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 11.0(0.7) MPP	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 9.3(4) 3rd Party	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 12.5(1)SR2	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 10.2(1)SR1	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 9.3(4)SR3 3rd Party	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 10.2(1)	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 12.5(1)	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 10.3(1)SR2	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 11-0-1MSR1-1	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 10.4(1) 3rd Party	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 12.5(1)SR1	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 11.5(1)SR1	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 10.1(1)SR2	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 12.0(1)SR2	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 12.6(1)	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 10.3(1.11) 3rd Party	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 12.0(1)	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 12.0(1)SR1	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 9.3(3)	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 12.5(1)SR3	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 10.3(1)SR4b	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 9.3(4)SR1 3rd Party	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 10.3(1)SR5	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 10.1(1.9)	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 10.3(1.9) 3rd Party	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 9.3(4)SR2 3rd Party	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 10.3(1)SR1	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 10.3(1)SR3	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 10.1(1)SR1	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 12.0(1)SR3	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 12.6(1)SR1	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 12.7(1)	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 10.3(1)SR6	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 12.8(1)	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 12.7(1)SR1	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 11.0(2)SR1	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 11.0(4)	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 11.0(2)	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 11.0(4)SR3	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 11.0(5)	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 11.0(3)SR2	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 11.0(3)SR4	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 11.0(3)SR3	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 11.0(2)SR2	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 11.0(4)SR1	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 11.0(5)SR3	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 11.0(3)	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 11.0(5)SR2	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 11.0(3)SR6	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 11.0(5)SR1	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 11.0(4)SR2	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 11.0(3)SR1	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 11.0(3)SR5	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 11.0(6)	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 12.8(1)SR1	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 12.8(1)SR2	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 14.0(1)	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 14.0(1)SR1	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 11.0(6)SR1	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 10.3(1)SR7	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 14.0(1)SR2	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 14.1(1)	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 14.0(1)SR3	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 11.0(6)SR2	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 14.1(1)SR1	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 14.1(1)SR2	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 11.0(6)SR4	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 14.2(1)	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 14.2(1)SR1	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 11.0(6)SR5	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 14.1(1)SR3	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 14.2(1)SR2	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 3.1(1)	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 3.0(1)	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 2.3(1)	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 2.3(1)SR1	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 2.2(1)	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 2.1(1)	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 2.0(1)	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 14.2(1)SR3	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 3.1(1)SR1	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 14.3(1)	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 3.2(1)	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 14.3(1)SR1	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 14.2(1)SR4	Not specified
CNA	Cisco	Cisco Session Initiation Protocol SIP Software	affected 11.0(6)SR6	Not specified

References

Reference	Source	Link	Tags
sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-phone-...	[email protected]	sec.cloudapps.cisco.com	Vendor Advisory
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis

No vendor comments have been submitted for this CVE.

Additional Advisory Data

Exploits

CNA: The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.

There are currently no legacy QID mappings associated with this CVE.