CVE-2026-20010: Cisco Nexus 3000 and 9000 Series Switches Link Layer Discovery Protocol Denial of Service Vulnerability
Cisco · Cisco NX-OS Software
Affected: Cisco NX-OS Software · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 8% of scored CVEs
DescriptionCVE.org
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).
Affected products3
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- Cisco · Cisco NX-OS Software10.3(1); 10.3(2); 10.3(3); 10.4(1); 10.3(99w); 10.3(3w) and 11 more
- Cisco · Cisco NX-OS System Software in ACI Mode16.0(2h); 16.0(2j); 16.0(3d); 16.0(3e); 16.0(4c); 16.0(5h) and 15 more
- Cisco · Cisco Unified Computing System (Managed)4.3(4e); 4.3(6b); 4.3(4c); 4.3(4f); 4.3(6d); 4.3(5e) and 7 more
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- Cisco
- Published
- February 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-20010 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.