High 7.4Published Feb 25, 2026

CVE-2026-20010Cisco Nexus 3000 and 9000 Series Switches Link Layer Discovery Protocol Denial of Service Vulnerability

Updated under an hour ago (Oct 27, 2026, 9:23 AM ET)

Does this affect you?

It affects Cisco NX-OS Software and 2 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Cisco NX-OS Software

Exploited in the last 30 days

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. 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).

CVSS: 7.4 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Weakness (CWE): CWE-805
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: cisco
NVD analysis: Deferred
Record last updated: Feb 25, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Cisco Cisco NX-OS Software cisco:nx_os_software (from the name)	10.3(1); 10.3(2); 10.3(3); 10.4(1); 10.3(99w); 10.3(3w); 10.3(99x); 10.3(3o); and 9 more ranges	CNA record
Cisco Cisco NX-OS System Software in ACI Mode cisco:nx_os_system_software_in_aci_mode (from the name)	16.0(2h); 16.0(2j); 16.0(3d); 16.0(3e); 16.0(4c); 16.0(5h); 16.0(3g); 16.0(5j); and 13 more ranges	CNA record
Cisco Cisco Unified Computing System (Managed) cisco:unified_computing_system_managed (from the name)	4.3(4e); 4.3(6b); 4.3(4c); 4.3(4f); 4.3(6d); 4.3(5e); 4.3(4d); 4.3(4b); and 5 more ranges	CNA record

References

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-n3kn9k_aci_lldp_dos-NdgRrrA3

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.