CVE-2024-20294

What it is

A vulnerability in the Link Layer Discovery Protocol (LLDP) feature of Cisco FXOS Software and Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper handling of specific fields in an LLDP frame. An attacker could exploit this vulnerability by sending a crafted LLDP packet to an interface of an affected device and having an authenticated user retrieve LLDP statistics from the affected device through CLI show commands or Simple Network Management Protocol (SNMP) requests. A successful exploit could allow the attacker to cause the LLDP service to crash and stop running on the affected device. In certain situations, the LLDP crash may result in a reload of the affected device. Note: LLDP is a Layer 2 link protocol. To exploit this vulnerability, an attacker would need to be directly connected to an interface of an affected device, either physically or logically (for example, through a Layer 2 Tunnel configured to transport the LLDP protocol).

At a glance

Exploitability

Can be exploited from the same network segment without logging in, but needs a user to act. High risk of service disruption.

Exploit odds

0.3% chance of exploitation in the next 30 days (EPSS).

Fix

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

Timeline

1. 2024-02-29 01:43 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 07:06 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.3% in the next 30 days (EPSS).
• Severity: 6.6 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2024-02-29 01:43 UTC

Last modified

2026-06-17 07:06 UTC

Exploit probability

0.3% · EPSS, next 30 days

Weakness

CWE-805

Record status

Analyzed

Affected

• Cisco Firepower Extensible Operating System 2.2.1.63
• Cisco Firepower Extensible Operating System 2.2.1.66
• Cisco Firepower Extensible Operating System 2.2.1.70
• Cisco Firepower Extensible Operating System 2.2.2.17
• Cisco Firepower Extensible Operating System 2.2.2.19
• Cisco Firepower Extensible Operating System 2.2.2.24
• Cisco Firepower Extensible Operating System 2.2.2.26
• Cisco Firepower Extensible Operating System 2.2.2.28

Attack profile CVSS 3.1 · 6.6

Attack vector

Adjacent network

Complexity

Low

Privileges needed

None

User interaction

Required

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

Is it in your code?

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