Cisco NX-OS LLDP buffer access with incorrect length value

Summaryinfo

A vulnerability described as critical has been identified in Cisco NX-OS, Unified Computing System and Firepower Extensible Operating System. Affected by this vulnerability is an unknown functionality of the component LLDP. Such manipulation leads to buffer access with incorrect length value. This vulnerability is traded as CVE-2024-20294. Access to the local network is required for this attack to succeed. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Cisco NX-OS, Unified Computing System and Firepower Extensible Operating System (Virtualization Software) (unknown version). Affected by this issue is an unknown code block of the component LLDP. The manipulation with an unknown input leads to a buffer access with incorrect length value vulnerability. Using CWE to declare the problem leads to CWE-805. The product uses a sequential operation to read or write a buffer, but it uses an incorrect length value that causes it to access memory that is outside of the bounds of the buffer. Impacted is availability. CVE summarizes:

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).

The weakness was shared 02/28/2024 as cisco-sa-nxos-lldp-dos-z7PncTgt. The advisory is available at sec.cloudapps.cisco.com. This vulnerability is handled as CVE-2024-20294 since 11/08/2023. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 05/22/2025).

Upgrading eliminates this vulnerability.

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Productinfo

Type

• Virtualization Software

Vendor

• Cisco

Name

• Firepower Extensible Operating System
• NX-OS
• Unified Computing System

License

• commercial

Website

• Vendor: https://www.cisco.com/

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