CVE-2025-20111

Adjacent device reload via crafted Ethernet frames

Published Feb 26, 2025 · Updated Feb 26, 2025

Denial of service in Cisco NX-OS Software on affected Nexus switches allows attackers on an adjacent Layer 2 network to force a reload. The health monitoring diagnostics incorrectly handle a sustained rate of crafted Ethernet frames, causing L2ACLRedirect or RewriteEngineLoopback to fail ten times and trigger a kernel-panic reboot. No authentication is required, but the attacker must share an Ethernet segment; Cisco reports no confidentiality or integrity effect.

CVSS severity7.4
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Cisco NX-OS Software on affected Nexus switches allows attackers on an adjacent Layer 2 network to force a reload. The health monitoring diagnostics incorrectly handle a sustained rate of crafted Ethernet frames, causing L2ACLRedirect or RewriteEngineLoopback to fail ten times and trigger a kernel-panic reboot. No authentication is required, but the attacker must share an Ethernet segment; Cisco reports no confidentiality or integrity effect.

The record

CVE
CVE-2025-20111
Published
Feb 26, 2025
Updated
Feb 26, 2025
Vendor
ClamAV
Product
Cisco NX-OS Software
Classifications
CWE-1220, T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=10.1(1)
  2. Affected versionversion=10.1(2)
  3. Affected versionversion=10.1(2t)
  4. Affected versionversion=10.2(1)
  5. Affected versionversion=10.2(1q)
  6. Affected versionversion=10.2(2)
  7. Affected versionversion=10.2(2a)
  8. Affected versionversion=10.2(3)
  9. Affected versionversion=10.2(3t)
  10. Affected versionversion=10.2(3v)
  11. Affected versionversion=10.2(4)
  12. Affected versionversion=10.2(5)
  13. Affected versionversion=10.2(6)
  14. Affected versionversion=10.2(7)
  15. Affected versionversion=10.2(8)
  16. Affected versionversion=10.3(1)
  17. Affected versionversion=10.3(2)
  18. Affected versionversion=10.3(3)
  19. Affected versionversion=10.3(3o)
  20. Affected versionversion=10.3(3p)
  21. Affected versionversion=10.3(3q)
  22. Affected versionversion=10.3(3r)
  23. Affected versionversion=10.3(3w)
  24. Affected versionversion=10.3(3x)
  25. Affected versionversion=10.3(4)
  26. Affected versionversion=10.3(4a)
  27. Affected versionversion=10.3(4g)
  28. Affected versionversion=10.3(4h)
  29. Affected versionversion=10.3(5)
  30. Affected versionversion=10.3(99w)
  31. Affected versionversion=10.3(99x)
  32. Affected versionversion=10.4(1)
  33. Affected versionversion=10.4(2)
  34. Affected versionversion=10.4(3)
  35. Affected versionversion=10.5(1)
  36. Affected versionversion=9.3(1)
  37. Affected versionversion=9.3(10)
  38. Affected versionversion=9.3(11)
  39. Affected versionversion=9.3(12)
  40. Affected versionversion=9.3(13)
  41. Affected versionversion=9.3(14)
  42. Affected versionversion=9.3(1z)
  43. Affected versionversion=9.3(2)
  44. Affected versionversion=9.3(3)
  45. Affected versionversion=9.3(4)
  46. Affected versionversion=9.3(5)
  47. Affected versionversion=9.3(5w)
  48. Affected versionversion=9.3(6)
  49. Affected versionversion=9.3(7)
  50. Affected versionversion=9.3(7a)
  51. Affected versionversion=9.3(7k)
  52. Affected versionversion=9.3(8)
  53. Affected versionversion=9.3(9)

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco NX-OS Softwareversion=10.1(1); version=10.1(2); version=10.1(2t); version=10.2(1); version=10.2(1q); version=10.2(2); version=10.2(2a); version=10.2(3); version=10.2(3t); version=10.2(3v); version=10.2(4); version=10.2(5); version=10.2(6); version=10.2(7); version=10.2(8); version=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(5); version=10.3(99w); version=10.3(99x); version=10.4(1); version=10.4(2); version=10.4(3); version=10.5(1); version=9.3(1); version=9.3(10); version=9.3(11); version=9.3(12); version=9.3(13); version=9.3(14); version=9.3(1z); version=9.3(2); version=9.3(3); version=9.3(4); version=9.3(5); version=9.3(5w); version=9.3(6); version=9.3(7); version=9.3(7a); version=9.3(7k); version=9.3(8); version=9.3(9)

Published CVSS scores

7.4CiscoCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-1220Insufficient Granularity of Access Control
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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