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High7.4Cisco

High [CVE-2026-20010] Cisco NX-OS Software Link Layer Discovery Protocol Denial of Service Vulnerability

This high-severity Cisco advisory covers CVE-2026-20010 affecting Cisco Unified Computing System (Managed), Cisco NX-OS Software 10.3(1), Cisco NX-OS Software 10.3(2).

cisco-sa-n3kn9k_aci_lldp_dos-NdgRrrA3 Published Feb 25, 2026Updated by vendor Feb 25, 2026
CVE-2026-20010
Affected products & platforms
CiscoSwitchesNexusNX-OS
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Summary

A vulnerability in the Link Layer Discovery Protocol (LLDP) feature of Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause the LLDP process to restart, which could cause an affected device to reload unexpectedly. 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. A successful exploit could allow the attacker to cause the device to reload, resulting in a denial of service (DoS) condition.

Affected products named by the advisory: Cisco Unified Computing System (Managed); Cisco NX-OS Software 10.3(1); Cisco NX-OS Software 10.3(2); Cisco NX-OS Software 10.3(3); and 5 more.

Affected versions
  • Scope: This vulnerability affects the following Cisco products if they are running a vulnerable software release and have the LLDP feature enabled globally and on at least one interface:
  • Release 4.3 (first fixed: 4.3(6e) / 4.3(6.260003))

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions
  • 4.3(6e) / 4.3(6.260003)

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Upgrade to the first fixed release for your train per the Fixed Releases table in this advisory.
  • Release 4.3: upgrade to 4.3(6e) / 4.3(6.260003).
Workaround status
  • There are no workarounds that address this vulnerability.

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

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