CVE-2026-20010
Cisco Nexus 3000 and 9000 Series Switches Link Layer Discovery Protocol Denial of Service Vulnerability
At a glance
- Source
- NVD
- EPSS
- EPSS 0.19 % · percentile 8 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- cisco
- NVD status
- Deferred
Description
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).
Weaknesses (CWE)
- CWE-805 — Buffer Access with Incorrect Length Value
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.4 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H | cisco |
| CVSS 3.1 | HIGH 7.4 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H | NVD · psirt@cisco.com (Secondary) |
European references
- ENISA EUVD · EUVD-2026-8664
- GCVE · GCVE-0-2026-20010
CERT-FR advisories
- CERTFR-2026-AVI-0213 — Multiples vulnérabilités dans les produits Cisco · cert.ssi.gouv.fr
Affected products
| Product | Versions |
|---|---|
| Cisco · Cisco NX-OS Software | affected 10.3(1) ; affected 10.3(2) ; affected 10.3(3) ; affected 10.4(1) ; affected 10.3(99w) ; affected 10.3(3w) |
| Cisco · Cisco NX-OS System Software in ACI Mode | affected 16.0(2h) ; affected 16.0(2j) ; affected 16.0(3d) ; affected 16.0(3e) ; affected 16.0(4c) ; affected 16.0(5h) |
| Cisco · Cisco Unified Computing System (Managed) | affected 4.3(4e) ; affected 4.3(6b) ; affected 4.3(4c) ; affected 4.3(4f) ; affected 4.3(6d) ; affected 4.3(5e) |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |