CVE-2025-20262Network attack vector

Authenticated PIM6 process crash via ephemeral query

Published Aug 27, 2025 · Updated Aug 27, 2025

Improper PIM6 query processing in Cisco NX-OS Software allows remote authenticated users to crash and restart the PIM6 process. The PIM6 feature improperly processes a crafted ephemeral data query delivered through NX-API REST, NETCONF, RESTCONF, gRPC, or Model Driven Telemetry. Exposure requires standalone Nexus 3000 or 9000 mode with PIM6 and at least one disabled-by-default management feature enabled; exploitation can flap adjacencies and interrupt PIM6 and ephemeral-query processing.

CVSS severity5.0
Medium
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper PIM6 query processing in Cisco NX-OS Software allows remote authenticated users to crash and restart the PIM6 process. The PIM6 feature improperly processes a crafted ephemeral data query delivered through NX-API REST, NETCONF, RESTCONF, gRPC, or Model Driven Telemetry. Exposure requires standalone Nexus 3000 or 9000 mode with PIM6 and at least one disabled-by-default management feature enabled; exploitation can flap adjacencies and interrupt PIM6 and ephemeral-query processing.

The record

CVE
CVE-2025-20262
Published
Aug 27, 2025
Updated
Aug 27, 2025
Vendor
ClamAV
Product
Cisco NX-OS Software
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 27, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 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(6)
  31. Affected versionversion=10.3(99w)
  32. Affected versionversion=10.3(99x)
  33. Affected versionversion=10.4(1)
  34. Affected versionversion=10.4(2)
  35. Affected versionversion=10.4(3)
  36. Affected versionversion=10.4(4)
  37. Affected versionversion=10.4(4g)
  38. Affected versionversion=10.5(1)
  39. Affected versionversion=10.5(2)
  40. Affected versionversion=9.2(1)
  41. Affected versionversion=9.2(2)
  42. Affected versionversion=9.2(2t)
  43. Affected versionversion=9.2(2v)
  44. Affected versionversion=9.2(3)
  45. Affected versionversion=9.2(3y)
  46. Affected versionversion=9.2(4)
  47. Affected versionversion=9.3(1)
  48. Affected versionversion=9.3(10)
  49. Affected versionversion=9.3(11)
  50. Affected versionversion=9.3(12)
  51. Affected versionversion=9.3(13)
  52. Affected versionversion=9.3(14)
  53. Affected versionversion=9.3(1z)
  54. Affected versionversion=9.3(2)
  55. Affected versionversion=9.3(3)
  56. Affected versionversion=9.3(4)
  57. Affected versionversion=9.3(5)
  58. Affected versionversion=9.3(5w)
  59. Affected versionversion=9.3(6)
  60. Affected versionversion=9.3(7)
  61. Affected versionversion=9.3(7a)
  62. Affected versionversion=9.3(7k)
  63. Affected versionversion=9.3(8)
  64. Affected versionversion=9.3(9)

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

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(6); version=10.3(99w); version=10.3(99x); version=10.4(1); version=10.4(2); version=10.4(3); version=10.4(4); version=10.4(4g); version=10.5(1); version=10.5(2); version=9.2(1); version=9.2(2); version=9.2(2t); version=9.2(2v); version=9.2(3); version=9.2(3y); version=9.2(4); 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

5.0CiscoCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L/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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

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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