CVE-2019-1684

What it is

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.

At a glance

Exploitability

Can be exploited from the same network segment without logging in. High risk of service disruption.

Exploit odds

0.6% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2019-02-21 20:29 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 02:29 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.6% in the next 30 days (EPSS).
• Severity: 6.5 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2019-02-21 20:29 UTC

Last modified

2026-06-17 02:29 UTC

Exploit probability

0.6% · EPSS, next 30 days

Weakness

CWE-399

Record status

Modified

Affected

• Cisco Ip Phone 8800 Firmware < 12.6\(1\)mn80
• Cisco Ip Phone 7800 Firmware < 12.6\(1\)mn80
• Cisco Ip Conference Phone 7832 Firmware < 12.6\(1\)mn80
• Cisco Ip Conference Phone 8832 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

Attack profile CVSS 3.1 · 6.5

Attack vector

Adjacent network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Is it in your code?

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