🔐 CVE Alert

CVE-2026-20010

HIGH 7.4

Cisco Nexus 3000 and 9000 Series Switches Link Layer Discovery Protocol Denial of Service Vulnerability

CVSS Score
7.4
EPSS Score
0.0%
EPSS Percentile
0th

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).

CWE CWE-805
Vendor cisco
Product cisco nx-os software
Ecosystems
Industries
NetworkingTelecommunications
Published Feb 25, 2026
Last Updated Feb 25, 2026
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CVSS v3 Breakdown

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
None
Availability
High

Affected Versions

Cisco / Cisco NX-OS Software
10.3(1) 10.3(2) 10.3(3) 10.4(1) 10.3(99w) 10.3(3w) 10.3(99x) 10.3(3o) 10.3(4) 10.3(3p) 10.3(4a) 10.4(2) 10.3(3q) 10.3(3x) 10.3(4g) 10.3(3r) 10.3(4h)
Cisco / Cisco NX-OS System Software in ACI Mode
16.0(2h) 16.0(2j) 16.0(3d) 16.0(3e) 16.0(4c) 16.0(5h) 16.0(3g) 16.0(5j) 16.0(6c) 16.1(1f) 16.0(7e) 16.0(8e) 16.0(8f) 16.1(2f) 16.1(2g) 16.0(9c) 16.1(3f) 16.0(9d) 16.0(6h) 16.0(8h) 16.1(3g)
Cisco / Cisco Unified Computing System (Managed)
4.3(4e) 4.3(6b) 4.3(4c) 4.3(4f) 4.3(6d) 4.3(5e) 4.3(4d) 4.3(4b) 4.3(5a) 4.3(5c) 4.3(5d) 4.3(6c) 4.3(6a)

References

NVD ↗ CVE.org ↗ EPSS Data ↗
sec.cloudapps.cisco.com: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-n3kn9k_aci_lldp_dos-NdgRrrA3