LLDP Vulnerability in Cisco NX-OS Software
CVE-2026-20010

7.4HIGH

Key Information:

Vendor

Cisco
Status
Cisco Nx-os Software
Cisco Nx-os System Software In Aci Mode
Cisco Unified Computing System (managed)
Vendor
CVE Published:
25 February 2026

Badges

👾 Exploit Exists

What is CVE-2026-20010?

A vulnerability in the Link Layer Discovery Protocol (LLDP) feature of Cisco NX-OS Software enables unauthenticated, adjacent attackers to disrupt network operations by causing the LLDP process to restart. This is a result of improper handling of specific fields within LLDP frames. An attacker could exploit this issue by sending specially crafted LLDP packets to a targeted device's interface. If successful, this would lead to an unexpected device reload, creating a denial of service condition. To exploit this vulnerability, attackers must be connected directly to the affected device's interface, either physically or through a Layer 2 Tunnel. Proper security measures and device configuration are critical to mitigating this risk.

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Affected Version(s)

Cisco NX-OS Software 10.3(1)

Cisco NX-OS Software 10.3(2)

Cisco NX-OS Software 10.3(3)

References

https://sec.cloudapps.cisco.com/security/center/content/C...

CVSS V3.1

Score:
7.4
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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