What’s Vulnerable › Vulnerabilities

CVE-2023-20018

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-01-20 · updated 2026-06-17
• Weakness: CWE-288

Description

A vulnerability in the web-based management interface of Cisco IP Phone 7800 and 8800 Series Phones could allow an unauthenticated, remote attacker to bypass authentication on an affected device. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending a crafted request to the web-based management interface. A successful exploit could allow the attacker to access certain parts of the web interface that would normally require authentication.

Affected products

• Cisco Ip Phone 7800 Firmware: before 14.1\(1\)sr2 — fixed in 14.1\(1\)sr2
• Cisco Ip Phone 7811 Firmware: before 14.1\(1\)sr2 — fixed in 14.1\(1\)sr2
• Cisco Ip Phone 7821 Firmware: before 14.1\(1\)sr2 — fixed in 14.1\(1\)sr2
• Cisco Ip Phone 7832 Firmware: before 14.1\(1\)sr2 — fixed in 14.1\(1\)sr2
• Cisco Ip Phone 7841 Firmware: before 14.1\(1\)sr2 — fixed in 14.1\(1\)sr2
• Cisco Ip Phone 7861 Firmware: before 14.1\(1\)sr2 — fixed in 14.1\(1\)sr2
• Cisco Ip Phone 8800 Firmware: before 14.1\(1\)sr2 — fixed in 14.1\(1\)sr2
• Cisco Ip Phone 8811 Firmware: before 14.1\(1\)sr2 — fixed in 14.1\(1\)sr2
• Cisco Ip Phone 8821-Ex Firmware: before 14.1\(1\)sr2 — fixed in 14.1\(1\)sr2
• Cisco Ip Phone 8821 Firmware: before 14.1\(1\)sr2 — fixed in 14.1\(1\)sr2
• Cisco Ip Phone 8831 Firmware: before 14.1\(1\)sr2 — fixed in 14.1\(1\)sr2
• Cisco Ip Phone 8832 Firmware: before 14.1\(1\)sr2 — fixed in 14.1\(1\)sr2
• Cisco Ip Phone 8841 Firmware: before 14.1\(1\)sr2 — fixed in 14.1\(1\)sr2
• Cisco Ip Phone 8845 Firmware: before 14.1\(1\)sr2 — fixed in 14.1\(1\)sr2
• Cisco Ip Phone 8851 Firmware: before 14.1\(1\)sr2 — fixed in 14.1\(1\)sr2
• Cisco Ip Phone 8861 Firmware: before 14.1\(1\)sr2 — fixed in 14.1\(1\)sr2
• Cisco Ip Phone 8865 Firmware: before 14.1\(1\)sr2 — fixed in 14.1\(1\)sr2
• Cisco Ip Phones 8832 Firmware: before 14.1\(1\)sr2 — fixed in 14.1\(1\)sr2
• Cisco Unified Ip Phone 8851Nr Firmware: before 14.1\(1\)sr2 — fixed in 14.1\(1\)sr2
• Cisco Unified Ip Phone 8865Nr Firmware: before 14.1\(1\)sr2 — fixed in 14.1\(1\)sr2
• Cisco Wireless Ip Phone 8821-Ex Firmware: before 11.0\(6\)sr4 — fixed in 11.0\(6\)sr4
• Cisco Wireless Ip Phone 8821 Firmware: before 11.0\(6\)sr4 — fixed in 11.0\(6\)sr4

How to fix

Upgrade to a fixed version: Cisco Ip Phone 7800 Firmware 14.1\(1\)sr2; Cisco Ip Phone 7811 Firmware 14.1\(1\)sr2; Cisco Ip Phone 7821 Firmware 14.1\(1\)sr2; Cisco Ip Phone 7832 Firmware 14.1\(1\)sr2; Cisco Ip Phone 7841 Firmware 14.1\(1\)sr2; Cisco Ip Phone 7861 Firmware 14.1\(1\)sr2; Cisco Ip Phone 8800 Firmware 14.1\(1\)sr2; Cisco Ip Phone 8811 Firmware 14.1\(1\)sr2; Cisco Ip Phone 8821-Ex Firmware 14.1\(1\)sr2; Cisco Ip Phone 8821 Firmware 14.1\(1\)sr2; Cisco Ip Phone 8831 Firmware 14.1\(1\)sr2; Cisco Ip Phone 8832 Firmware 14.1\(1\)sr2. Check the vendor advisory for mitigations.

References

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ip-phone-auth-bypass-pSqxZRPR
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ip-phone-auth-bypass-pSqxZRPR

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