CVE-2025-20202

Controller reload via malformed CDP neighbor reports

Published May 7, 2025 · Updated May 7, 2025

Denial of service in Cisco IOS XE Wireless Controller Software allows attackers to reload a controller via a crafted CDP packet sent to an AP. The controller insufficiently validates length values in AP CDP neighbor reports before processing them. An attacker must send the packet to a managed AP with CDP enabled, which is the default; exploitation unexpectedly reloads its controller and interrupts the wireless network.

CVSS severity7.4
High
EPSS probability0.22%
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 IOS XE Wireless Controller Software allows attackers to reload a controller via a crafted CDP packet sent to an AP. The controller insufficiently validates length values in AP CDP neighbor reports before processing them. An attacker must send the packet to a managed AP with CDP enabled, which is the default; exploitation unexpectedly reloads its controller and interrupts the wireless network.

The record

CVE
CVE-2025-20202
Published
May 7, 2025
Updated
May 7, 2025
Vendor
ClamAV
Product
Cisco IOS XE Software
Classifications
CWE-805, T1529
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 7, 2025CVE publishedPublication date reported by the CVE source.
  2. May 7, 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=16.10.1
  2. Affected versionversion=16.10.1a
  3. Affected versionversion=16.10.1b
  4. Affected versionversion=16.10.1c
  5. Affected versionversion=16.10.1d
  6. Affected versionversion=16.10.1e
  7. Affected versionversion=16.10.1f
  8. Affected versionversion=16.10.1g
  9. Affected versionversion=16.10.1s
  10. Affected versionversion=16.10.2
  11. Affected versionversion=16.10.3
  12. Affected versionversion=16.11.1
  13. Affected versionversion=16.11.1a
  14. Affected versionversion=16.11.1b
  15. Affected versionversion=16.11.1s
  16. Affected versionversion=16.11.2
  17. Affected versionversion=16.12.1
  18. Affected versionversion=16.12.10
  19. Affected versionversion=16.12.10a
  20. Affected versionversion=16.12.11
  21. Affected versionversion=16.12.12
  22. Affected versionversion=16.12.1a
  23. Affected versionversion=16.12.1c
  24. Affected versionversion=16.12.1s
  25. Affected versionversion=16.12.1t
  26. Affected versionversion=16.12.1w
  27. Affected versionversion=16.12.1x
  28. Affected versionversion=16.12.1y
  29. Affected versionversion=16.12.1z1
  30. Affected versionversion=16.12.1z2
  31. Affected versionversion=16.12.2
  32. Affected versionversion=16.12.2a
  33. Affected versionversion=16.12.2s
  34. Affected versionversion=16.12.3
  35. Affected versionversion=16.12.3a
  36. Affected versionversion=16.12.3s
  37. Affected versionversion=16.12.4
  38. Affected versionversion=16.12.4a
  39. Affected versionversion=16.12.5
  40. Affected versionversion=16.12.5a
  41. Affected versionversion=16.12.5b
  42. Affected versionversion=16.12.6
  43. Affected versionversion=16.12.6a
  44. Affected versionversion=16.12.7
  45. Affected versionversion=16.12.8
  46. Affected versionversion=16.12.9
  47. Affected versionversion=17.10.1
  48. Affected versionversion=17.10.1a
  49. Affected versionversion=17.10.1b
  50. Affected versionversion=17.1.1
  51. Affected versionversion=17.11.1
  52. Affected versionversion=17.11.1a
  53. Affected versionversion=17.11.99SW
  54. Affected versionversion=17.1.1a
  55. Affected versionversion=17.1.1s
  56. Affected versionversion=17.1.1t
  57. Affected versionversion=17.12.1
  58. Affected versionversion=17.12.1a
  59. Affected versionversion=17.12.1w
  60. Affected versionversion=17.12.1x
  61. Affected versionversion=17.12.1y
  62. Affected versionversion=17.12.1z
  63. Affected versionversion=17.12.1z1
  64. Affected versionversion=17.12.2
  65. Affected versionversion=17.12.2a
  66. Affected versionversion=17.12.3
  67. Affected versionversion=17.12.3a
  68. Affected versionversion=17.12.4
  69. Affected versionversion=17.12.4a
  70. Affected versionversion=17.12.4b
  71. Affected versionversion=17.1.3
  72. Affected versionversion=17.13.1
  73. Affected versionversion=17.13.1a
  74. Affected versionversion=17.14.1
  75. Affected versionversion=17.14.1a
  76. Affected versionversion=17.15.1
  77. Affected versionversion=17.15.1a
  78. Affected versionversion=17.15.1b
  79. Affected versionversion=17.15.1w
  80. Affected versionversion=17.2.1
  81. Affected versionversion=17.2.1a
  82. Affected versionversion=17.2.1r
  83. Affected versionversion=17.2.1v
  84. Affected versionversion=17.2.2
  85. Affected versionversion=17.2.3
  86. Affected versionversion=17.3.1
  87. Affected versionversion=17.3.1a
  88. Affected versionversion=17.3.1w
  89. Affected versionversion=17.3.1x
  90. Affected versionversion=17.3.1z
  91. Affected versionversion=17.3.2
  92. Affected versionversion=17.3.2a
  93. Affected versionversion=17.3.3
  94. Affected versionversion=17.3.4
  95. Affected versionversion=17.3.4a
  96. Affected versionversion=17.3.4b
  97. Affected versionversion=17.3.4c
  98. Affected versionversion=17.3.5
  99. Affected versionversion=17.3.5a
  100. Affected versionversion=17.3.5b
  101. Affected versionversion=17.3.6
  102. Affected versionversion=17.3.7
  103. Affected versionversion=17.3.8
  104. Affected versionversion=17.3.8a
  105. Affected versionversion=17.4.1
  106. Affected versionversion=17.4.1a
  107. Affected versionversion=17.4.1b
  108. Affected versionversion=17.4.2
  109. Affected versionversion=17.4.2a
  110. Affected versionversion=17.5.1
  111. Affected versionversion=17.5.1a
  112. Affected versionversion=17.6.1
  113. Affected versionversion=17.6.1a
  114. Affected versionversion=17.6.1w
  115. Affected versionversion=17.6.1x
  116. Affected versionversion=17.6.1y
  117. Affected versionversion=17.6.1z
  118. Affected versionversion=17.6.1z1
  119. Affected versionversion=17.6.2
  120. Affected versionversion=17.6.3
  121. Affected versionversion=17.6.3a
  122. Affected versionversion=17.6.4
  123. Affected versionversion=17.6.5
  124. Affected versionversion=17.6.5a
  125. Affected versionversion=17.6.6
  126. Affected versionversion=17.6.6a
  127. Affected versionversion=17.6.7
  128. Affected versionversion=17.6.8
  129. Affected versionversion=17.6.8a
  130. Affected versionversion=17.7.1
  131. Affected versionversion=17.7.1a
  132. Affected versionversion=17.7.1b
  133. Affected versionversion=17.7.2
  134. Affected versionversion=17.8.1
  135. Affected versionversion=17.8.1a
  136. Affected versionversion=17.9.1
  137. Affected versionversion=17.9.1a
  138. Affected versionversion=17.9.1w
  139. Affected versionversion=17.9.1x
  140. Affected versionversion=17.9.1x1
  141. Affected versionversion=17.9.1y
  142. Affected versionversion=17.9.1y1
  143. Affected versionversion=17.9.2
  144. Affected versionversion=17.9.2a
  145. Affected versionversion=17.9.3
  146. Affected versionversion=17.9.3a
  147. Affected versionversion=17.9.4
  148. Affected versionversion=17.9.4a
  149. Affected versionversion=17.9.5
  150. Affected versionversion=17.9.5a
  151. Affected versionversion=17.9.5b
  152. Affected versionversion=17.9.5e
  153. Affected versionversion=17.9.5f

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco IOS XE Softwareversion=16.10.1; version=16.10.1a; version=16.10.1b; version=16.10.1c; version=16.10.1d; version=16.10.1e; version=16.10.1f; version=16.10.1g; version=16.10.1s; version=16.10.2; version=16.10.3; version=16.11.1; version=16.11.1a; version=16.11.1b; version=16.11.1s; version=16.11.2; version=16.12.1; version=16.12.10; version=16.12.10a; version=16.12.11; version=16.12.12; version=16.12.1a; version=16.12.1c; version=16.12.1s; version=16.12.1t; version=16.12.1w; version=16.12.1x; version=16.12.1y; version=16.12.1z1; version=16.12.1z2; version=16.12.2; version=16.12.2a; version=16.12.2s; version=16.12.3; version=16.12.3a; version=16.12.3s; version=16.12.4; version=16.12.4a; version=16.12.5; version=16.12.5a; version=16.12.5b; version=16.12.6; version=16.12.6a; version=16.12.7; version=16.12.8; version=16.12.9; version=17.10.1; version=17.10.1a; version=17.10.1b; version=17.1.1; version=17.11.1; version=17.11.1a; version=17.11.99SW; version=17.1.1a; version=17.1.1s; version=17.1.1t; version=17.12.1; version=17.12.1a; version=17.12.1w; version=17.12.1x; version=17.12.1y; version=17.12.1z; version=17.12.1z1; version=17.12.2; version=17.12.2a; version=17.12.3; version=17.12.3a; version=17.12.4; version=17.12.4a; version=17.12.4b; version=17.1.3; version=17.13.1; version=17.13.1a; version=17.14.1; version=17.14.1a; version=17.15.1; version=17.15.1a; version=17.15.1b; version=17.15.1w; version=17.2.1; version=17.2.1a; version=17.2.1r; version=17.2.1v; version=17.2.2; version=17.2.3; version=17.3.1; version=17.3.1a; version=17.3.1w; version=17.3.1x; version=17.3.1z; version=17.3.2; version=17.3.2a; version=17.3.3; version=17.3.4; version=17.3.4a; version=17.3.4b; 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=17.4.1a; version=17.4.1b; version=17.4.2; version=17.4.2a; version=17.5.1; version=17.5.1a; version=17.6.1; version=17.6.1a; version=17.6.1w; version=17.6.1x; version=17.6.1y; version=17.6.1z; version=17.6.1z1; version=17.6.2; version=17.6.3; version=17.6.3a; 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=17.6.8a; version=17.7.1; version=17.7.1a; version=17.7.1b; version=17.7.2; version=17.8.1; version=17.8.1a; version=17.9.1; version=17.9.1a; version=17.9.1w; version=17.9.1x; version=17.9.1x1; version=17.9.1y; version=17.9.1y1; version=17.9.2; version=17.9.2a; version=17.9.3; version=17.9.3a; version=17.9.4; version=17.9.4a; version=17.9.5; version=17.9.5a; version=17.9.5b; version=17.9.5e; version=17.9.5f

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.

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-805Buffer Access with Incorrect Length Value
T1529System Shutdown/Reboot

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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