CVE-2025-20365

Adjacent gateway modification via crafted IPv6 advertisements

Published Sep 24, 2025 · Updated Sep 24, 2025

IPv6 Router Advertisement processing in Cisco Access Point Software allows attackers to alter a device's IPv6 gateway via crafted packets. The IPv6 RA packet-processing logic trusts crafted advertisements received from associated wireless clients and replaces the device's gateway. Exploitation requires wireless association and CAPWAP over IPv6; the gateway change is temporary and causes intermittent packet loss for associated clients.

CVSS severity4.3
Medium
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

IPv6 Router Advertisement processing in Cisco Access Point Software allows attackers to alter a device's IPv6 gateway via crafted packets. The IPv6 RA packet-processing logic trusts crafted advertisements received from associated wireless clients and replaces the device's gateway. Exploitation requires wireless association and CAPWAP over IPv6; the gateway change is temporary and causes intermittent packet loss for associated clients.

The record

CVE
CVE-2025-20365
Published
Sep 24, 2025
Updated
Sep 24, 2025
Vendor
ClamAV
Product
Cisco Aironet Access Point Software (IOS XE Controller)
Classifications
CWE-940
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 2025Record 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=16.10.1
  2. Affected versionversion=16.10.1e
  3. Affected versionversion=16.11.1
  4. Affected versionversion=16.11.1a
  5. Affected versionversion=16.11.1b
  6. Affected versionversion=16.11.1c
  7. Affected versionversion=16.12.1
  8. Affected versionversion=16.12.1s
  9. Affected versionversion=16.12.1t
  10. Affected versionversion=16.12.2s
  11. Affected versionversion=16.12.3
  12. Affected versionversion=16.12.4
  13. Affected versionversion=16.12.4a
  14. Affected versionversion=16.12.5
  15. Affected versionversion=16.12.6
  16. Affected versionversion=16.12.6a
  17. Affected versionversion=16.12.7
  18. Affected versionversion=16.12.8
  19. Affected versionversion=17.10.1
  20. Affected versionversion=17.1.1
  21. Affected versionversion=17.11.1
  22. Affected versionversion=17.1.1s
  23. Affected versionversion=17.1.1t
  24. Affected versionversion=17.12.1
  25. Affected versionversion=17.12.2
  26. Affected versionversion=17.12.3
  27. Affected versionversion=17.12.5
  28. Affected versionversion=17.13.1
  29. Affected versionversion=17.14.1
  30. Affected versionversion=17.15.1
  31. Affected versionversion=17.2.1
  32. Affected versionversion=17.2.1a
  33. Affected versionversion=17.2.2
  34. Affected versionversion=17.2.3
  35. Affected versionversion=17.3.1
  36. Affected versionversion=17.3.2
  37. Affected versionversion=17.3.2a
  38. Affected versionversion=17.3.3
  39. Affected versionversion=17.3.4
  40. Affected versionversion=17.3.4c
  41. Affected versionversion=17.3.5
  42. Affected versionversion=17.3.5a
  43. Affected versionversion=17.3.5b
  44. Affected versionversion=17.3.6
  45. Affected versionversion=17.3.7
  46. Affected versionversion=17.3.8
  47. Affected versionversion=17.3.8a
  48. Affected versionversion=17.4.1
  49. Affected versionversion=17.5.1
  50. Affected versionversion=17.6.1
  51. Affected versionversion=17.6.2
  52. Affected versionversion=17.6.3
  53. Affected versionversion=17.6.4
  54. Affected versionversion=17.6.5
  55. Affected versionversion=17.6.5a
  56. Affected versionversion=17.6.6
  57. Affected versionversion=17.6.6a
  58. Affected versionversion=17.6.7
  59. Affected versionversion=17.6.8
  60. Affected versionversion=17.7.1
  61. Affected versionversion=17.8.1
  62. Affected versionversion=17.9.1
  63. Affected versionversion=17.9.2
  64. Affected versionversion=17.9.3
  65. Affected versionversion=17.9.4
  66. Affected versionversion=17.9.4a
  67. Affected versionversion=17.9.5
  68. Affected versionversion=17.9.6
  69. Affected versionversion=17.9.7

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco Aironet Access Point Software (IOS XE Controller)version=16.10.1; version=16.10.1e; version=16.11.1; version=16.11.1a; version=16.11.1b; version=16.11.1c; version=16.12.1; version=16.12.1s; version=16.12.1t; version=16.12.2s; version=16.12.3; version=16.12.4; version=16.12.4a; version=16.12.5; version=16.12.6; version=16.12.6a; version=16.12.7; version=16.12.8; version=17.10.1; version=17.1.1; version=17.11.1; version=17.1.1s; version=17.1.1t; version=17.12.1; version=17.12.2; version=17.12.3; version=17.12.5; version=17.13.1; version=17.14.1; version=17.15.1; version=17.2.1; version=17.2.1a; version=17.2.2; version=17.2.3; version=17.3.1; version=17.3.2; version=17.3.2a; version=17.3.3; version=17.3.4; version=17.3.4c; version=17.3.5; version=17.3.5a; version=17.3.5b; version=17.3.6; version=17.3.7; version=17.3.8; version=17.3.8a; version=17.4.1; version=17.5.1; version=17.6.1; version=17.6.2; version=17.6.3; version=17.6.4; version=17.6.5; version=17.6.5a; version=17.6.6; version=17.6.6a; version=17.6.7; version=17.6.8; version=17.7.1; version=17.8.1; version=17.9.1; version=17.9.2; version=17.9.3; version=17.9.4; version=17.9.4a; version=17.9.5; version=17.9.6; version=17.9.7

Published CVSS scores

4.3CiscoCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-940Improper Verification of Source of a Communication Channel

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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