CVE-2019-1684: Cisco IP Conference Phone 7832 Firmware

Medium severity, CVSS 6.5. EPSS: 0.6% chance of exploitation in the next 30 days.

A vulnerability in the Cisco Discovery Protocol or Link Layer Discovery Protocol (LLDP) implementation for the Cisco IP Phone 7800 and 8800 Series could allow an unauthenticated, adjacent attacker to cause an affected phone to reload unexpectedly, resulting in a temporary denial of service (DoS) condition. The vulnerability is due to missing length validation of certain Cisco Discovery Protocol or LLDP packet header fields. An attacker could exploit this vulnerability by sending a malicious Cisco Discovery Protocol or LLDP packet to the targeted phone. A successful exploit could allow the attacker to cause the affected phone to reload unexpectedly, resulting in a temporary DoS condition. Versions prior to 12.6(1)MN80 are affected.

Affected products

Cisco IP Conference Phone 7832 Firmware: before 12.6\(1\)mn80 (fixed in 12.6\(1\)mn80)
Cisco IP Conference Phone 8832 Firmware: before 12.6\(1\)mn80 (fixed in 12.6\(1\)mn80)
Cisco IP Phone 7800 Firmware: before 12.6\(1\)mn80 (fixed in 12.6\(1\)mn80)
Cisco IP Phone 7811 Firmware: before 12.6\(1\)mn80 (fixed in 12.6\(1\)mn80)
Cisco IP Phone 7821 Firmware: before 12.6\(1\)mn80 (fixed in 12.6\(1\)mn80)
Cisco IP Phone 7841 Firmware: before 12.6\(1\)mn80 (fixed in 12.6\(1\)mn80)
Cisco IP Phone 7861 Firmware: before 12.6\(1\)mn80 (fixed in 12.6\(1\)mn80)
Cisco IP Phone 8800 Firmware: before 12.6\(1\)mn80 (fixed in 12.6\(1\)mn80)
Cisco IP Phone 8811 Firmware: before 12.6\(1\)mn80 (fixed in 12.6\(1\)mn80)
Cisco IP Phone 8841 Firmware: before 12.6\(1\)mn80 (fixed in 12.6\(1\)mn80)
Cisco IP Phone 8845 Firmware: before 12.6\(1\)mn80 (fixed in 12.6\(1\)mn80)
Cisco IP Phone 8851 Firmware: before 12.6\(1\)mn80 (fixed in 12.6\(1\)mn80)
Cisco IP Phone 8861 Firmware: before 12.6\(1\)mn80 (fixed in 12.6\(1\)mn80)
Cisco IP Phone 8865 Firmware: before 12.6\(1\)mn80 (fixed in 12.6\(1\)mn80)

Published 2019-02-21. Last modified 2026-06-17.