CVE-2025-20240Network attack vector

Cookie theft via unsanitized reflected input

Published Sep 24, 2025 · Updated Sep 26, 2025

Reflected XSS in Cisco IOS XE Software Web Authentication allows remote attackers to steal device user cookies through a malicious link. The Web Authentication response fails to sanitize user-supplied input before reflecting it into browser-rendered content. Exploitation requires HTTP or HTTPS and Web Authentication to be enabled and a user to follow the crafted link; script execution can expose that user's session cookie.

CVSS severity6.1
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Cisco IOS XE Software Web Authentication allows remote attackers to steal device user cookies through a malicious link. The Web Authentication response fails to sanitize user-supplied input before reflecting it into browser-rendered content. Exploitation requires HTTP or HTTPS and Web Authentication to be enabled and a user to follow the crafted link; script execution can expose that user's session cookie.

The record

CVE
CVE-2025-20240
Published
Sep 24, 2025
Updated
Sep 26, 2025
Vendor
ClamAV
Product
Cisco IOS XE Software
Classifications
CWE-692, T1539
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 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=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=16.12.13
  23. Affected versionversion=16.12.1a
  24. Affected versionversion=16.12.1c
  25. Affected versionversion=16.12.1s
  26. Affected versionversion=16.12.1t
  27. Affected versionversion=16.12.1w
  28. Affected versionversion=16.12.1x
  29. Affected versionversion=16.12.1y
  30. Affected versionversion=16.12.1z1
  31. Affected versionversion=16.12.1z2
  32. Affected versionversion=16.12.2
  33. Affected versionversion=16.12.2a
  34. Affected versionversion=16.12.2s
  35. Affected versionversion=16.12.3
  36. Affected versionversion=16.12.3a
  37. Affected versionversion=16.12.3s
  38. Affected versionversion=16.12.4
  39. Affected versionversion=16.12.4a
  40. Affected versionversion=16.12.5
  41. Affected versionversion=16.12.5a
  42. Affected versionversion=16.12.5b
  43. Affected versionversion=16.12.6
  44. Affected versionversion=16.12.6a
  45. Affected versionversion=16.12.7
  46. Affected versionversion=16.12.8
  47. Affected versionversion=16.12.9
  48. Affected versionversion=16.6.1
  49. Affected versionversion=16.6.10
  50. Affected versionversion=16.6.2
  51. Affected versionversion=16.6.3
  52. Affected versionversion=16.6.4
  53. Affected versionversion=16.6.4a
  54. Affected versionversion=16.6.5
  55. Affected versionversion=16.6.5a
  56. Affected versionversion=16.6.6
  57. Affected versionversion=16.6.7
  58. Affected versionversion=16.6.8
  59. Affected versionversion=16.6.9
  60. Affected versionversion=16.7.1
  61. Affected versionversion=16.7.1a
  62. Affected versionversion=16.7.1b
  63. Affected versionversion=16.7.2
  64. Affected versionversion=16.7.3
  65. Affected versionversion=16.7.4
  66. Affected versionversion=16.8.1
  67. Affected versionversion=16.8.1a
  68. Affected versionversion=16.8.1b
  69. Affected versionversion=16.8.1c
  70. Affected versionversion=16.8.1d
  71. Affected versionversion=16.8.1e
  72. Affected versionversion=16.8.1s
  73. Affected versionversion=16.8.2
  74. Affected versionversion=16.8.3
  75. Affected versionversion=16.9.1
  76. Affected versionversion=16.9.1a
  77. Affected versionversion=16.9.1b
  78. Affected versionversion=16.9.1s
  79. Affected versionversion=16.9.2
  80. Affected versionversion=16.9.3
  81. Affected versionversion=16.9.3a
  82. Affected versionversion=16.9.4
  83. Affected versionversion=16.9.5
  84. Affected versionversion=16.9.5f
  85. Affected versionversion=16.9.6
  86. Affected versionversion=16.9.7
  87. Affected versionversion=16.9.8
  88. Affected versionversion=17.10.1
  89. Affected versionversion=17.10.1a
  90. Affected versionversion=17.10.1b
  91. Affected versionversion=17.1.1
  92. Affected versionversion=17.11.1
  93. Affected versionversion=17.11.1a
  94. Affected versionversion=17.1.1a
  95. Affected versionversion=17.1.1s
  96. Affected versionversion=17.1.1t
  97. Affected versionversion=17.12.1
  98. Affected versionversion=17.12.1a
  99. Affected versionversion=17.12.1w
  100. Affected versionversion=17.12.1x
  101. Affected versionversion=17.12.1y
  102. Affected versionversion=17.12.1z
  103. Affected versionversion=17.12.1z1
  104. Affected versionversion=17.12.1z2
  105. Affected versionversion=17.12.1z3
  106. Affected versionversion=17.12.1z4
  107. Affected versionversion=17.12.2
  108. Affected versionversion=17.12.2a
  109. Affected versionversion=17.12.3
  110. Affected versionversion=17.12.3a
  111. Affected versionversion=17.12.4
  112. Affected versionversion=17.12.4a
  113. Affected versionversion=17.12.4b
  114. Affected versionversion=17.12.5
  115. Affected versionversion=17.12.5a
  116. Affected versionversion=17.12.5b
  117. Affected versionversion=17.12.5c
  118. Affected versionversion=17.1.3
  119. Affected versionversion=17.13.1
  120. Affected versionversion=17.13.1a
  121. Affected versionversion=17.14.1
  122. Affected versionversion=17.14.1a
  123. Affected versionversion=17.15.1
  124. Affected versionversion=17.15.1a
  125. Affected versionversion=17.15.1b
  126. Affected versionversion=17.15.1w
  127. Affected versionversion=17.15.1x
  128. Affected versionversion=17.15.1y
  129. Affected versionversion=17.15.2
  130. Affected versionversion=17.15.2a
  131. Affected versionversion=17.15.2b
  132. Affected versionversion=17.15.2c
  133. Affected versionversion=17.15.3
  134. Affected versionversion=17.15.3a
  135. Affected versionversion=17.15.3b
  136. Affected versionversion=17.16.1
  137. Affected versionversion=17.16.1a
  138. Affected versionversion=17.2.1
  139. Affected versionversion=17.2.1a
  140. Affected versionversion=17.2.1r
  141. Affected versionversion=17.2.1v
  142. Affected versionversion=17.2.2
  143. Affected versionversion=17.2.3
  144. Affected versionversion=17.3.1
  145. Affected versionversion=17.3.1a
  146. Affected versionversion=17.3.1w
  147. Affected versionversion=17.3.1x
  148. Affected versionversion=17.3.1z
  149. Affected versionversion=17.3.2
  150. Affected versionversion=17.3.2a
  151. Affected versionversion=17.3.3
  152. Affected versionversion=17.3.4
  153. Affected versionversion=17.3.4a
  154. Affected versionversion=17.3.4b
  155. Affected versionversion=17.3.4c
  156. Affected versionversion=17.3.5
  157. Affected versionversion=17.3.5a
  158. Affected versionversion=17.3.5b
  159. Affected versionversion=17.3.6
  160. Affected versionversion=17.3.7
  161. Affected versionversion=17.3.8
  162. Affected versionversion=17.3.8a
  163. Affected versionversion=17.4.1
  164. Affected versionversion=17.4.1a
  165. Affected versionversion=17.4.1b
  166. Affected versionversion=17.4.2
  167. Affected versionversion=17.4.2a
  168. Affected versionversion=17.5.1
  169. Affected versionversion=17.5.1a
  170. Affected versionversion=17.6.1
  171. Affected versionversion=17.6.1a
  172. Affected versionversion=17.6.1w
  173. Affected versionversion=17.6.1x
  174. Affected versionversion=17.6.1y
  175. Affected versionversion=17.6.1z
  176. Affected versionversion=17.6.1z1
  177. Affected versionversion=17.6.2
  178. Affected versionversion=17.6.3
  179. Affected versionversion=17.6.3a
  180. Affected versionversion=17.6.4
  181. Affected versionversion=17.6.5
  182. Affected versionversion=17.6.5a
  183. Affected versionversion=17.6.6
  184. Affected versionversion=17.6.6a
  185. Affected versionversion=17.6.7
  186. Affected versionversion=17.6.8
  187. Affected versionversion=17.6.8a
  188. Affected versionversion=17.7.1
  189. Affected versionversion=17.7.1a
  190. Affected versionversion=17.7.1b
  191. Affected versionversion=17.7.2
  192. Affected versionversion=17.8.1
  193. Affected versionversion=17.8.1a
  194. Affected versionversion=17.9.1
  195. Affected versionversion=17.9.1a
  196. Affected versionversion=17.9.1w
  197. Affected versionversion=17.9.1x
  198. Affected versionversion=17.9.1x1
  199. Affected versionversion=17.9.1y
  200. Affected versionversion=17.9.1y1
  201. Affected versionversion=17.9.2
  202. Affected versionversion=17.9.2a
  203. Affected versionversion=17.9.3
  204. Affected versionversion=17.9.3a
  205. Affected versionversion=17.9.4
  206. Affected versionversion=17.9.4a
  207. Affected versionversion=17.9.5
  208. Affected versionversion=17.9.5a
  209. Affected versionversion=17.9.5b
  210. Affected versionversion=17.9.5e
  211. Affected versionversion=17.9.5f
  212. Affected versionversion=17.9.6
  213. Affected versionversion=17.9.6a
  214. Affected versionversion=17.9.7
  215. Affected versionversion=17.9.7a
  216. Affected versionversion=17.9.7b

What conditions does exploitation require?

Attack vectornetwork
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=16.12.13; 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=16.6.1; version=16.6.10; version=16.6.2; version=16.6.3; version=16.6.4; version=16.6.4a; version=16.6.5; version=16.6.5a; version=16.6.6; version=16.6.7; version=16.6.8; version=16.6.9; version=16.7.1; version=16.7.1a; version=16.7.1b; version=16.7.2; version=16.7.3; version=16.7.4; version=16.8.1; version=16.8.1a; version=16.8.1b; version=16.8.1c; version=16.8.1d; version=16.8.1e; version=16.8.1s; version=16.8.2; version=16.8.3; version=16.9.1; version=16.9.1a; version=16.9.1b; version=16.9.1s; version=16.9.2; version=16.9.3; version=16.9.3a; version=16.9.4; version=16.9.5; version=16.9.5f; version=16.9.6; version=16.9.7; version=16.9.8; 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=17.1.1a; 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=17.12.1z2; version=17.12.1z3; version=17.12.1z4; 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=17.12.5; version=17.12.5a; version=17.12.5b; version=17.12.5c; 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=17.15.1x; version=17.15.1y; version=17.15.2; version=17.15.2a; version=17.15.2b; version=17.15.2c; version=17.15.3; version=17.15.3a; version=17.15.3b; version=17.16.1; version=17.16.1a; 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; version=17.9.6; version=17.9.6a; version=17.9.7; version=17.9.7a; version=17.9.7b

Published CVSS scores

6.1CiscoCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-692Incomplete Denylist to Cross-Site Scripting
T1539Steal Web Session Cookie

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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