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CVE-2022-20817: Cisco IP Phone Duplicate Key Vulnerability

• Severity: high (CVSS 7.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-06-15 · updated 2026-06-17
• Weakness: CWE-338

Description

A vulnerability in Cisco Unified IP Phones could allow an unauthenticated, remote attacker to impersonate another user's phone if the Cisco Unified Communications Manager (CUCM) is in secure mode. This vulnerability is due to improper key generation during the manufacturing process that could result in duplicated manufactured keys installed on multiple devices. An attacker could exploit this vulnerability by performing a machine-in-the-middle attack on the secure communication between the phone and the CUCM. A successful exploit could allow the attacker to impersonate another user's phone. This vulnerability cannot be addressed with software updates. There is a workaround that addresses this vulnerability.

Affected products

• Cisco Ata 187 Analog Telephone Adapter Firmware: all versions
• Cisco Unified Ip Phone 6911 Firmware: all versions
• Cisco Unified Ip Phone 6921 Firmware: all versions
• Cisco Unified Ip Phone 6941 Firmware: all versions
• Cisco Unified Ip Phone 6945 Firmware: all versions
• Cisco Unified Ip Phone 6961 Firmware: all versions
• Cisco Unified Ip Phone 8941 Firmware: all versions
• Cisco Unified Ip Phone 8945 Firmware: all versions
• Cisco Unified Ip Phone 8961 Firmware: all versions
• Cisco Unified Ip Phone 9951 Firmware: all versions
• Cisco Unified Ip Phone 9971 Firmware: all versions

References

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cp6901-dup-cert-82jdJGe4
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cp6901-dup-cert-82jdJGe4

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