CVE-2019-1683: Cisco SPA112 Firmware

High severity, CVSS 7.4. EPSS: 0.9% chance of exploitation in the next 30 days.

A vulnerability in the certificate handling component of the Cisco SPA112, SPA525, and SPA5X5 Series IP Phones could allow an unauthenticated, remote attacker to listen to or control some aspects of a Transport Level Security (TLS)-encrypted Session Initiation Protocol (SIP) conversation. The vulnerability is due to the improper validation of server certificates. An attacker could exploit this vulnerability by crafting a malicious server certificate to present to the client. An exploit could allow an attacker to eavesdrop on TLS-encrypted traffic and potentially route or redirect calls initiated by an affected device. Affected software include version 7.6.2 of the Cisco Small Business SPA525 Series IP Phones and Cisco Small Business SPA5X5 Series IP Phones and version 1.4.2 of the Cisco Small Business SPA500 Series IP Phones and Cisco Small Business SPA112 Series IP Phones.

Affected products

• Cisco SPA112 Firmware: version 1.4.2 only
• Cisco SPA500 Firmware: version 1.4.2 only
• Cisco SPA500DS Firmware: version 1.4.2 only
• Cisco SPA500S Firmware: version 1.4.2 only
• Cisco SPA501G Firmware: version 1.4.2 only
• Cisco SPA502G Firmware: version 1.4.2 only
• Cisco SPA504G Firmware: version 1.4.2 only
• Cisco SPA508G Firmware: version 1.4.2 only
• Cisco SPA509G Firmware: version 1.4.2 only
• Cisco SPA512G Firmware: version 1.4.2 only
• Cisco SPA514G Firmware: version 1.4.2 only
• Cisco SPA525 Firmware: version 7.6.2 only
• Cisco SPA525G Firmware: version 1.4.2 only
• Cisco SPA5X5 Firmware: version 7.6.2 only

Published 2019-02-25. Last modified 2026-06-17.