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CVE-2022-20774: Cisco IP Phone 6800, 7800, and 8800 Series with Multiplatform Firmware Cross-Site Request Forgery Vulnerability

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-04-06 · updated 2026-06-17
• Weakness: CWE-345

Description

A vulnerability in the web-based management interface of Cisco IP Phone 6800, 7800, and 8800 Series with Multiplatform Firmware could allow an unauthenticated, remote attacker to conduct a cross-site request forgery (CSRF) attack against a user of the web-based interface of an affected system. This vulnerability is due to insufficient CSRF protections for the web-based management interface of an affected device. An attacker could exploit this vulnerability by persuading an authenticated user of the interface to follow a crafted link. A successful exploit could allow the attacker to perform configuration changes on the affected device, resulting in a denial of service (DoS) condition.

Affected products

• Cisco Ip Phone 6825 Firmware: before 11.3.5 — fixed in 11.3.5
• Cisco Ip Phone 6841 Firmware: before 11.3.5 — fixed in 11.3.5
• Cisco Ip Phone 6851 Firmware: before 11.3.5 — fixed in 11.3.5
• Cisco Ip Phone 6861 Firmware: before 11.3.5 — fixed in 11.3.5
• Cisco Ip Phone 6871 Firmware: before 11.3.5 — fixed in 11.3.5
• Cisco Ip Phone 7811 Firmware: before 11.3.5 — fixed in 11.3.5
• Cisco Ip Phone 7821 Firmware: before 11.3.5 — fixed in 11.3.5
• Cisco Ip Phone 7832 Firmware: before 11.3.5 — fixed in 11.3.5
• Cisco Ip Phone 7841 Firmware: before 11.3.5 — fixed in 11.3.5
• Cisco Ip Phone 7861 Firmware: before 11.3.5 — fixed in 11.3.5
• Cisco Ip Phone 8811 Firmware: before 11.3.5 — fixed in 11.3.5
• Cisco Ip Phone 8832 Firmware: before 11.3.5 — fixed in 11.3.5
• Cisco Ip Phone 8841 Firmware: before 11.3.5 — fixed in 11.3.5
• Cisco Ip Phone 8845 Firmware: before 11.3.5 — fixed in 11.3.5
• Cisco Ip Phone 8851 Firmware: before 11.3.5 — fixed in 11.3.5
• Cisco Ip Phone 8861 Firmware: before 11.3.5 — fixed in 11.3.5
• Cisco Ip Phone 8865 Firmware: before 11.3.5 — fixed in 11.3.5

How to fix

Upgrade to a fixed version: Cisco Ip Phone 6825 Firmware 11.3.5; Cisco Ip Phone 6841 Firmware 11.3.5; Cisco Ip Phone 6851 Firmware 11.3.5; Cisco Ip Phone 6861 Firmware 11.3.5; Cisco Ip Phone 6871 Firmware 11.3.5; Cisco Ip Phone 7811 Firmware 11.3.5; Cisco Ip Phone 7821 Firmware 11.3.5; Cisco Ip Phone 7832 Firmware 11.3.5; Cisco Ip Phone 7841 Firmware 11.3.5; Cisco Ip Phone 7861 Firmware 11.3.5; Cisco Ip Phone 8811 Firmware 11.3.5; Cisco Ip Phone 8832 Firmware 11.3.5. Check the vendor advisory for mitigations.

References

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-voip-phone-csrf-K56vXvVx
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-voip-phone-csrf-K56vXvVx

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