CVE-2026-20010

Device reload via malformed LLDP frame fields

Published Feb 25, 2026 · Updated Feb 25, 2026

Incorrect-length buffer access in the LLDP feature of Cisco NX-OS allows attackers to reload affected devices via a crafted LLDP frame. The frame parser uses incorrect length values while handling specific LLDP fields, restarting the LLDP process and triggering a device reload. Exploitation requires direct physical or logical Layer 2 connectivity to an LLDP-receiving interface; the bounded consequence is a service interruption through reload.

CVSS severity7.4
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect-length buffer access in the LLDP feature of Cisco NX-OS allows attackers to reload affected devices via a crafted LLDP frame. The frame parser uses incorrect length values while handling specific LLDP fields, restarting the LLDP process and triggering a device reload. Exploitation requires direct physical or logical Layer 2 connectivity to an LLDP-receiving interface; the bounded consequence is a service interruption through reload.

The record

CVE
CVE-2026-20010
Published
Feb 25, 2026
Updated
Feb 25, 2026
Vendor
ClamAV
Product
Cisco UCS Manager
Classifications
CWE-805, T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.3(4b)
  2. Affected versionversion=4.3(4c)
  3. Affected versionversion=4.3(4d)
  4. Affected versionversion=4.3(4e)
  5. Affected versionversion=4.3(4f)
  6. Affected versionversion=4.3(5a)
  7. Affected versionversion=4.3(5c)
  8. Affected versionversion=4.3(5d)
  9. Affected versionversion=4.3(5e)
  10. Affected versionversion=4.3(6a)
  11. Affected versionversion=4.3(6b)
  12. Affected versionversion=4.3(6c)
  13. Affected versionversion=4.3(6d)

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco UCS Managerversion=4.3(4b); version=4.3(4c); version=4.3(4d); version=4.3(4e); version=4.3(4f); version=4.3(5a); version=4.3(5c); version=4.3(5d); version=4.3(5e); version=4.3(6a); version=4.3(6b); version=4.3(6c); version=4.3(6d)
ClamAV · Cisco NX-OSversion=10.3(1); version=10.3(2); version=10.3(3); version=10.3(3o); version=10.3(3p); version=10.3(3q); version=10.3(3r); version=10.3(3w); version=10.3(3x); version=10.3(4); version=10.3(4a); version=10.3(4g); version=10.3(4h); version=10.3(99w); version=10.3(99x); version=10.4(1); version=10.4(2)
ClamAV · Cisco NX-OS in ACI Modeversion=16.0(2h); version=16.0(2j); version=16.0(3d); version=16.0(3e); version=16.0(3g); version=16.0(4c); version=16.0(5h); version=16.0(5j); version=16.0(6c); version=16.0(6h); version=16.0(7e); version=16.0(8e); version=16.0(8f); version=16.0(8h); version=16.0(9c); version=16.0(9d); version=16.1(1f); version=16.1(2f); version=16.1(2g); version=16.1(3f); version=16.1(3g)

Published CVSS scores

7.4Cisco Systems, Inc.CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-805Buffer Access with Incorrect Length Value
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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