What’s Vulnerable › Vulnerabilities

CVE-2019-1684: Cisco IP Phone 7800 and 8800 Series Cisco Discovery Protocol and Link Layer Discovery Protocol Denial of Service Vulnerability

Description

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

How to fix

Upgrade to a fixed version: Cisco Ip Conference Phone 7832 Firmware 12.6\(1\)mn80; Cisco Ip Conference Phone 8832 Firmware 12.6\(1\)mn80; Cisco Ip Phone 7800 Firmware 12.6\(1\)mn80; Cisco Ip Phone 7811 Firmware 12.6\(1\)mn80; Cisco Ip Phone 7821 Firmware 12.6\(1\)mn80; Cisco Ip Phone 7841 Firmware 12.6\(1\)mn80; Cisco Ip Phone 7861 Firmware 12.6\(1\)mn80; Cisco Ip Phone 8800 Firmware 12.6\(1\)mn80; Cisco Ip Phone 8811 Firmware 12.6\(1\)mn80; Cisco Ip Phone 8841 Firmware 12.6\(1\)mn80; Cisco Ip Phone 8845 Firmware 12.6\(1\)mn80; Cisco Ip Phone 8851 Firmware 12.6\(1\)mn80. Check the vendor advisory for mitigations.

References

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