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).

No CVSS v4.0

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00015.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Cisco Cisco NX-OS Software unknown
Version Status Constraints
10.3(1) affected —
10.3(2) affected —
10.3(3) affected —
10.4(1) affected —
10.3(99w) affected —
10.3(3w) affected —
10.3(99x) affected —
10.3(3o) affected —
10.3(4) affected —
10.3(3p) affected —
10.3(4a) affected —
10.4(2) affected —
10.3(3q) affected —
10.3(3x) affected —
10.3(4g) affected —
10.3(3r) affected —
10.3(4h) affected —
Cisco Cisco NX-OS System Software in ACI Mode unknown
Version Status Constraints
16.0(2h) affected —
16.0(2j) affected —
16.0(3d) affected —
16.0(3e) affected —
16.0(4c) affected —
16.0(5h) affected —
16.0(3g) affected —
16.0(5j) affected —
16.0(6c) affected —
16.1(1f) affected —
16.0(7e) affected —
16.0(8e) affected —
16.0(8f) affected —
16.1(2f) affected —
16.1(2g) affected —
16.0(9c) affected —
16.1(3f) affected —
16.0(9d) affected —
16.0(6h) affected —
16.0(8h) affected —
16.1(3g) affected —
Cisco Cisco Unified Computing System (Managed) unknown
Version Status Constraints
4.3(4e) affected —
4.3(6b) affected —
4.3(4c) affected —
4.3(4f) affected —
4.3(6d) affected —
4.3(5e) affected —
4.3(4d) affected —
4.3(4b) affected —
4.3(5a) affected —
4.3(5c) affected —
4.3(5d) affected —
4.3(6c) affected —
4.3(6a) affected —

No data.

No data.

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Vendors Products
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Project Subscriptions

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-n3kn9k_aci_lldp_dos-NdgRrrA3 cve-icon cve-icon
History

Fri, 27 Feb 2026 06:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 26 Feb 2026 13:30:00 +0000

Type Values Removed Values Added
First Time appeared Cisco
Cisco nx-os Software
Cisco nx-os System Software In Aci Mode
Cisco unified Computing System Manager
Vendors & Products Cisco
Cisco nx-os Software
Cisco nx-os System Software In Aci Mode
Cisco unified Computing System Manager

Wed, 25 Feb 2026 17:15:00 +0000

Type Values Removed Values Added
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).
Title Cisco Nexus 3000 and 9000 Series Switches Link Layer Discovery Protocol Denial of Service Vulnerability
Weaknesses CWE-805
References
Metrics cvssV3_1

{'score': 7.4, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: cisco

Published:

Updated: 2026-02-25T19:05:49.108Z

Reserved: 2025-10-08T11:59:15.350Z

Link: CVE-2026-20010

cve-icon Vulnrichment

Updated: 2026-02-25T18:17:50.280Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-02-25T17:25:24.110

Modified: 2026-02-27T14:06:59.787

Link: CVE-2026-20010

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-02-26T13:15:30Z

Weaknesses