CVE-2021-1379: Cisco IP Conference Phone 7832 Firmware

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

Multiple vulnerabilities in the Cisco Discovery Protocol and Link Layer Discovery Protocol (LLDP) implementations for Cisco IP Phone Series 68xx/78xx/88xx could allow an unauthenticated, adjacent attacker to execute code remotely or cause a reload of an affected IP phone. These vulnerabilities are due to missing checks when the IP phone processes a Cisco Discovery Protocol or LLDP packet. An attacker could exploit these vulnerabilities by sending a malicious Cisco Discovery Protocol or LLDP packet to the targeted IP phone. A successful exploit could allow the attacker to execute code on the affected IP phone or cause it to reload unexpectedly, resulting in a denial of service (DoS) condition.Note: Cisco Discovery Protocol is a Layer 2 protocol. To exploit these vulnerabilities, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent).Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities.

Affected products

• Cisco IP Conference Phone 7832 Firmware: before 12.8\(1\) (fixed in 12.8\(1\)); version 12.8(1) only
• Cisco IP Conference Phone 7832 With Multiplatform Firmware: before 11.3\(2\) (fixed in 11.3\(2\))
• Cisco IP Conference Phone 8832 Firmware: before 12.8\(1\) (fixed in 12.8\(1\)); version 12.8(1) only
• Cisco IP Conference Phone 8832 With Multiplatform Firmware: before 11.3\(2\) (fixed in 11.3\(2\))
• Cisco IP Phone 6821 With Multiplatform Firmware: before 11.3\(2\) (fixed in 11.3\(2\))
• Cisco IP Phone 6841 With Multiplatform Firmware: before 11.3\(2\) (fixed in 11.3\(2\))
• Cisco IP Phone 6851 With Multiplatform Firmware: before 11.3\(2\) (fixed in 11.3\(2\))
• Cisco IP Phone 6861 With Multiplatform Firmware: before 11.3\(2\) (fixed in 11.3\(2\))
• Cisco IP Phone 6871 With Multiplatform Firmware: before 11.3\(2\) (fixed in 11.3\(2\))
• Cisco IP Phone 7811 Firmware: before 12.8\(1\) (fixed in 12.8\(1\)); version 12.8(1) only
• Cisco IP Phone 7811 With Multiplatform Firmware: before 11.3\(2\) (fixed in 11.3\(2\))
• Cisco IP Phone 7821 Firmware: before 12.8\(1\) (fixed in 12.8\(1\)); version 12.8(1) only
• Cisco IP Phone 7821 With Multiplatform Firmware: before 11.3\(2\) (fixed in 11.3\(2\))
• Cisco IP Phone 7841 Firmware: before 12.8\(1\) (fixed in 12.8\(1\)); version 12.8(1) only
• Cisco IP Phone 7841 With Multiplatform Firmware: before 11.3\(2\) (fixed in 11.3\(2\))
• Cisco IP Phone 7861 Firmware: before 12.8\(1\) (fixed in 12.8\(1\)); version 12.8(1) only
• Cisco IP Phone 7861 With Multiplatform Firmware: before 11.3\(2\) (fixed in 11.3\(2\))
• Cisco IP Phone 8811 Firmware: before 12.8\(1\) (fixed in 12.8\(1\)); version 12.8(1) only
• Cisco IP Phone 8811 With Multiplatform Firmware: before 11.3\(2\) (fixed in 11.3\(2\))
• Cisco IP Phone 8841 Firmware: before 12.8\(1\) (fixed in 12.8\(1\)); version 12.8(1) only
• Cisco IP Phone 8841 With Multiplatform Firmware: before 11.3\(2\) (fixed in 11.3\(2\))
• Cisco IP Phone 8845 Firmware: before 12.8\(1\) (fixed in 12.8\(1\)); version 12.8(1) only
• Cisco IP Phone 8845 With Multiplatform Firmware: before 11.3\(2\) (fixed in 11.3\(2\))
• Cisco IP Phone 8851 Firmware: before 12.8\(1\) (fixed in 12.8\(1\)); version 12.8(1) only
• Cisco IP Phone 8851 With Multiplatform Firmware: before 11.3\(2\) (fixed in 11.3\(2\))
• and 9 more

Published 2024-11-18. Last modified 2026-06-17.