CVE-2025-20263Network attack vector

Unauthenticated device reload via insufficient web-service bounds checks

Published Aug 14, 2025 · Updated Aug 14, 2025

Buffer overflow in Cisco ASA and FTD web services allows remote attackers to reload affected devices via crafted HTTP requests. The web services interface applies insufficient boundary checks to specific request data, allowing a malformed value to overflow a buffer. Exposure requires an enabled management HTTP server or REST API and a request from an address permitted by the configured HTTP range; successful exploitation reloads the device and interrupts service.

CVSS severity8.6
High
EPSS probability0.65%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Cisco ASA and FTD web services allows remote attackers to reload affected devices via crafted HTTP requests. The web services interface applies insufficient boundary checks to specific request data, allowing a malformed value to overflow a buffer. Exposure requires an enabled management HTTP server or REST API and a request from an address permitted by the configured HTTP range; successful exploitation reloads the device and interrupts service.

The record

CVE
CVE-2025-20263
Published
Aug 14, 2025
Updated
Aug 14, 2025
Vendor
ClamAV
Product
Cisco Adaptive Security Appliance (ASA) Software
Classifications
CWE-680, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 14, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 14, 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=9.12.1
  2. Affected versionversion=9.12.1.2
  3. Affected versionversion=9.12.1.3
  4. Affected versionversion=9.12.2
  5. Affected versionversion=9.12.2.1
  6. Affected versionversion=9.12.2.4
  7. Affected versionversion=9.12.2.5
  8. Affected versionversion=9.12.2.9
  9. Affected versionversion=9.12.3
  10. Affected versionversion=9.12.3.12
  11. Affected versionversion=9.12.3.2
  12. Affected versionversion=9.12.3.7
  13. Affected versionversion=9.12.3.9
  14. Affected versionversion=9.12.4
  15. Affected versionversion=9.12.4.10
  16. Affected versionversion=9.12.4.13
  17. Affected versionversion=9.12.4.18
  18. Affected versionversion=9.12.4.2
  19. Affected versionversion=9.12.4.24
  20. Affected versionversion=9.12.4.26
  21. Affected versionversion=9.12.4.29
  22. Affected versionversion=9.12.4.30
  23. Affected versionversion=9.12.4.35
  24. Affected versionversion=9.12.4.37
  25. Affected versionversion=9.12.4.38
  26. Affected versionversion=9.12.4.39
  27. Affected versionversion=9.12.4.4
  28. Affected versionversion=9.12.4.40
  29. Affected versionversion=9.12.4.41
  30. Affected versionversion=9.12.4.47
  31. Affected versionversion=9.12.4.48
  32. Affected versionversion=9.12.4.50
  33. Affected versionversion=9.12.4.52
  34. Affected versionversion=9.12.4.54
  35. Affected versionversion=9.12.4.55
  36. Affected versionversion=9.12.4.56
  37. Affected versionversion=9.12.4.58
  38. Affected versionversion=9.12.4.62
  39. Affected versionversion=9.12.4.65
  40. Affected versionversion=9.12.4.67
  41. Affected versionversion=9.12.4.7
  42. Affected versionversion=9.12.4.8
  43. Affected versionversion=9.14.1
  44. Affected versionversion=9.14.1.10
  45. Affected versionversion=9.14.1.15
  46. Affected versionversion=9.14.1.19
  47. Affected versionversion=9.14.1.30
  48. Affected versionversion=9.14.1.6
  49. Affected versionversion=9.14.2
  50. Affected versionversion=9.14.2.13
  51. Affected versionversion=9.14.2.15
  52. Affected versionversion=9.14.2.4
  53. Affected versionversion=9.14.2.8
  54. Affected versionversion=9.14.3
  55. Affected versionversion=9.14.3.1
  56. Affected versionversion=9.14.3.11
  57. Affected versionversion=9.14.3.13
  58. Affected versionversion=9.14.3.15
  59. Affected versionversion=9.14.3.18
  60. Affected versionversion=9.14.3.9
  61. Affected versionversion=9.14.4
  62. Affected versionversion=9.14.4.12
  63. Affected versionversion=9.14.4.13
  64. Affected versionversion=9.14.4.14
  65. Affected versionversion=9.14.4.15
  66. Affected versionversion=9.14.4.17
  67. Affected versionversion=9.14.4.22
  68. Affected versionversion=9.14.4.23
  69. Affected versionversion=9.14.4.24
  70. Affected versionversion=9.14.4.6
  71. Affected versionversion=9.14.4.7
  72. Affected versionversion=9.16.1
  73. Affected versionversion=9.16.1.28
  74. Affected versionversion=9.16.2
  75. Affected versionversion=9.16.2.11
  76. Affected versionversion=9.16.2.13
  77. Affected versionversion=9.16.2.14
  78. Affected versionversion=9.16.2.3
  79. Affected versionversion=9.16.2.7
  80. Affected versionversion=9.16.3
  81. Affected versionversion=9.16.3.14
  82. Affected versionversion=9.16.3.15
  83. Affected versionversion=9.16.3.19
  84. Affected versionversion=9.16.3.23
  85. Affected versionversion=9.16.3.3
  86. Affected versionversion=9.16.4
  87. Affected versionversion=9.16.4.14
  88. Affected versionversion=9.16.4.18
  89. Affected versionversion=9.16.4.19
  90. Affected versionversion=9.16.4.27
  91. Affected versionversion=9.16.4.38
  92. Affected versionversion=9.16.4.39
  93. Affected versionversion=9.16.4.42
  94. Affected versionversion=9.16.4.48
  95. Affected versionversion=9.16.4.55
  96. Affected versionversion=9.16.4.57
  97. Affected versionversion=9.16.4.61
  98. Affected versionversion=9.16.4.62
  99. Affected versionversion=9.16.4.67
  100. Affected versionversion=9.16.4.70
  101. Affected versionversion=9.16.4.71
  102. Affected versionversion=9.16.4.76
  103. Affected versionversion=9.16.4.9
  104. Affected versionversion=9.17.1
  105. Affected versionversion=9.17.1.10
  106. Affected versionversion=9.17.1.11
  107. Affected versionversion=9.17.1.13
  108. Affected versionversion=9.17.1.15
  109. Affected versionversion=9.17.1.20
  110. Affected versionversion=9.17.1.30
  111. Affected versionversion=9.17.1.33
  112. Affected versionversion=9.17.1.39
  113. Affected versionversion=9.17.1.45
  114. Affected versionversion=9.17.1.46
  115. Affected versionversion=9.17.1.7
  116. Affected versionversion=9.17.1.9
  117. Affected versionversion=9.18.1
  118. Affected versionversion=9.18.1.3
  119. Affected versionversion=9.18.2
  120. Affected versionversion=9.18.2.5
  121. Affected versionversion=9.18.2.7
  122. Affected versionversion=9.18.2.8
  123. Affected versionversion=9.18.3
  124. Affected versionversion=9.18.3.39
  125. Affected versionversion=9.18.3.46
  126. Affected versionversion=9.18.3.53
  127. Affected versionversion=9.18.3.55
  128. Affected versionversion=9.18.3.56
  129. Affected versionversion=9.18.4
  130. Affected versionversion=9.18.4.22
  131. Affected versionversion=9.18.4.24
  132. Affected versionversion=9.18.4.29
  133. Affected versionversion=9.18.4.34
  134. Affected versionversion=9.18.4.40
  135. Affected versionversion=9.18.4.47
  136. Affected versionversion=9.18.4.5
  137. Affected versionversion=9.18.4.50
  138. Affected versionversion=9.18.4.8
  139. Affected versionversion=9.19.1
  140. Affected versionversion=9.19.1.12
  141. Affected versionversion=9.19.1.18
  142. Affected versionversion=9.19.1.22
  143. Affected versionversion=9.19.1.24
  144. Affected versionversion=9.19.1.27
  145. Affected versionversion=9.19.1.28
  146. Affected versionversion=9.19.1.31
  147. Affected versionversion=9.19.1.37
  148. Affected versionversion=9.19.1.38
  149. Affected versionversion=9.19.1.5
  150. Affected versionversion=9.19.1.9
  151. Affected versionversion=9.20.1
  152. Affected versionversion=9.20.1.5
  153. Affected versionversion=9.20.2
  154. Affected versionversion=9.20.2.10
  155. Affected versionversion=9.20.2.21
  156. Affected versionversion=9.20.2.22
  157. Affected versionversion=9.20.3
  158. Affected versionversion=9.20.3.10
  159. Affected versionversion=9.20.3.4
  160. Affected versionversion=9.20.3.7
  161. Affected versionversion=9.20.3.9
  162. Affected versionversion=9.22.1.1
  163. Affected versionversion=9.22.1.2
  164. Affected versionversion=9.22.1.3
  165. Affected versionversion=9.8.1
  166. Affected versionversion=9.8.1.5
  167. Affected versionversion=9.8.1.7
  168. Affected versionversion=9.8.2
  169. Affected versionversion=9.8.2.14
  170. Affected versionversion=9.8.2.15
  171. Affected versionversion=9.8.2.17
  172. Affected versionversion=9.8.2.20
  173. Affected versionversion=9.8.2.24
  174. Affected versionversion=9.8.2.26
  175. Affected versionversion=9.8.2.28
  176. Affected versionversion=9.8.2.33
  177. Affected versionversion=9.8.2.35
  178. Affected versionversion=9.8.2.38
  179. Affected versionversion=9.8.2.45
  180. Affected versionversion=9.8.2.8
  181. Affected versionversion=9.8.3
  182. Affected versionversion=9.8.3.11
  183. Affected versionversion=9.8.3.14
  184. Affected versionversion=9.8.3.16
  185. Affected versionversion=9.8.3.18
  186. Affected versionversion=9.8.3.21
  187. Affected versionversion=9.8.3.26
  188. Affected versionversion=9.8.3.29
  189. Affected versionversion=9.8.3.8
  190. Affected versionversion=9.8.4
  191. Affected versionversion=9.8.4.10
  192. Affected versionversion=9.8.4.12
  193. Affected versionversion=9.8.4.15
  194. Affected versionversion=9.8.4.17
  195. Affected versionversion=9.8.4.20
  196. Affected versionversion=9.8.4.22
  197. Affected versionversion=9.8.4.25
  198. Affected versionversion=9.8.4.26
  199. Affected versionversion=9.8.4.29
  200. Affected versionversion=9.8.4.3
  201. Affected versionversion=9.8.4.32
  202. Affected versionversion=9.8.4.33
  203. Affected versionversion=9.8.4.34
  204. Affected versionversion=9.8.4.35
  205. Affected versionversion=9.8.4.39
  206. Affected versionversion=9.8.4.40
  207. Affected versionversion=9.8.4.41
  208. Affected versionversion=9.8.4.43
  209. Affected versionversion=9.8.4.44
  210. Affected versionversion=9.8.4.45
  211. Affected versionversion=9.8.4.46
  212. Affected versionversion=9.8.4.48
  213. Affected versionversion=9.8.4.7
  214. Affected versionversion=9.8.4.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco Adaptive Security Appliance (ASA) Softwareversion=9.12.1; version=9.12.1.2; version=9.12.1.3; version=9.12.2; version=9.12.2.1; version=9.12.2.4; version=9.12.2.5; version=9.12.2.9; version=9.12.3; version=9.12.3.12; version=9.12.3.2; version=9.12.3.7; version=9.12.3.9; version=9.12.4; version=9.12.4.10; version=9.12.4.13; version=9.12.4.18; version=9.12.4.2; version=9.12.4.24; version=9.12.4.26; version=9.12.4.29; version=9.12.4.30; version=9.12.4.35; version=9.12.4.37; version=9.12.4.38; version=9.12.4.39; version=9.12.4.4; version=9.12.4.40; version=9.12.4.41; version=9.12.4.47; version=9.12.4.48; version=9.12.4.50; version=9.12.4.52; version=9.12.4.54; version=9.12.4.55; version=9.12.4.56; version=9.12.4.58; version=9.12.4.62; version=9.12.4.65; version=9.12.4.67; version=9.12.4.7; version=9.12.4.8; version=9.14.1; version=9.14.1.10; version=9.14.1.15; version=9.14.1.19; version=9.14.1.30; version=9.14.1.6; version=9.14.2; version=9.14.2.13; version=9.14.2.15; version=9.14.2.4; version=9.14.2.8; version=9.14.3; version=9.14.3.1; version=9.14.3.11; version=9.14.3.13; version=9.14.3.15; version=9.14.3.18; version=9.14.3.9; version=9.14.4; version=9.14.4.12; version=9.14.4.13; version=9.14.4.14; version=9.14.4.15; version=9.14.4.17; version=9.14.4.22; version=9.14.4.23; version=9.14.4.24; version=9.14.4.6; version=9.14.4.7; version=9.16.1; version=9.16.1.28; version=9.16.2; version=9.16.2.11; version=9.16.2.13; version=9.16.2.14; version=9.16.2.3; version=9.16.2.7; version=9.16.3; version=9.16.3.14; version=9.16.3.15; version=9.16.3.19; version=9.16.3.23; version=9.16.3.3; version=9.16.4; version=9.16.4.14; version=9.16.4.18; version=9.16.4.19; version=9.16.4.27; version=9.16.4.38; version=9.16.4.39; version=9.16.4.42; version=9.16.4.48; version=9.16.4.55; version=9.16.4.57; version=9.16.4.61; version=9.16.4.62; version=9.16.4.67; version=9.16.4.70; version=9.16.4.71; version=9.16.4.76; version=9.16.4.9; version=9.17.1; version=9.17.1.10; version=9.17.1.11; version=9.17.1.13; version=9.17.1.15; version=9.17.1.20; version=9.17.1.30; version=9.17.1.33; version=9.17.1.39; version=9.17.1.45; version=9.17.1.46; version=9.17.1.7; version=9.17.1.9; version=9.18.1; version=9.18.1.3; version=9.18.2; version=9.18.2.5; version=9.18.2.7; version=9.18.2.8; version=9.18.3; version=9.18.3.39; version=9.18.3.46; version=9.18.3.53; version=9.18.3.55; version=9.18.3.56; version=9.18.4; version=9.18.4.22; version=9.18.4.24; version=9.18.4.29; version=9.18.4.34; version=9.18.4.40; version=9.18.4.47; version=9.18.4.5; version=9.18.4.50; version=9.18.4.8; version=9.19.1; version=9.19.1.12; version=9.19.1.18; version=9.19.1.22; version=9.19.1.24; version=9.19.1.27; version=9.19.1.28; version=9.19.1.31; version=9.19.1.37; version=9.19.1.38; version=9.19.1.5; version=9.19.1.9; version=9.20.1; version=9.20.1.5; version=9.20.2; version=9.20.2.10; version=9.20.2.21; version=9.20.2.22; version=9.20.3; version=9.20.3.10; version=9.20.3.4; version=9.20.3.7; version=9.20.3.9; version=9.22.1.1; version=9.22.1.2; version=9.22.1.3; version=9.8.1; version=9.8.1.5; version=9.8.1.7; version=9.8.2; version=9.8.2.14; version=9.8.2.15; version=9.8.2.17; version=9.8.2.20; version=9.8.2.24; version=9.8.2.26; version=9.8.2.28; version=9.8.2.33; version=9.8.2.35; version=9.8.2.38; version=9.8.2.45; version=9.8.2.8; version=9.8.3; version=9.8.3.11; version=9.8.3.14; version=9.8.3.16; version=9.8.3.18; version=9.8.3.21; version=9.8.3.26; version=9.8.3.29; version=9.8.3.8; version=9.8.4; version=9.8.4.10; version=9.8.4.12; version=9.8.4.15; version=9.8.4.17; version=9.8.4.20; version=9.8.4.22; version=9.8.4.25; version=9.8.4.26; version=9.8.4.29; version=9.8.4.3; version=9.8.4.32; version=9.8.4.33; version=9.8.4.34; version=9.8.4.35; version=9.8.4.39; version=9.8.4.40; version=9.8.4.41; version=9.8.4.43; version=9.8.4.44; version=9.8.4.45; version=9.8.4.46; version=9.8.4.48; version=9.8.4.7; version=9.8.4.8
ClamAV · Cisco Firepower Threat Defenseversion=6.2.3; version=6.2.3.1; version=6.2.3.10; version=6.2.3.11; version=6.2.3.12; version=6.2.3.13; version=6.2.3.14; version=6.2.3.15; version=6.2.3.16; version=6.2.3.17; version=6.2.3.18; version=6.2.3.2; version=6.2.3.3; version=6.2.3.4; version=6.2.3.5; version=6.2.3.6; version=6.2.3.7; version=6.2.3.8; version=6.2.3.9; version=6.4.0; version=6.4.0.1; version=6.4.0.10; version=6.4.0.11; version=6.4.0.12; version=6.4.0.13; version=6.4.0.14; version=6.4.0.15; version=6.4.0.16; version=6.4.0.17; version=6.4.0.18; version=6.4.0.2; version=6.4.0.3; version=6.4.0.4; version=6.4.0.5; version=6.4.0.6; version=6.4.0.7; version=6.4.0.8; version=6.4.0.9; version=6.6.0; version=6.6.0.1; version=6.6.1; version=6.6.3; version=6.6.4; version=6.6.5; version=6.6.5.1; version=6.6.5.2; version=6.6.7; version=6.6.7.1; version=6.6.7.2; version=7.0.0; version=7.0.0.1; version=7.0.1; version=7.0.1.1; version=7.0.2; version=7.0.2.1; version=7.0.3; version=7.0.4; version=7.0.5; version=7.0.6; version=7.0.6.1; version=7.0.6.2; version=7.0.6.3; version=7.0.7; version=7.1.0; version=7.1.0.1; version=7.1.0.2; version=7.1.0.3; version=7.2.0; version=7.2.0.1; version=7.2.1; version=7.2.2; version=7.2.3; version=7.2.4; version=7.2.4.1; version=7.2.5; version=7.2.5.1; version=7.2.5.2; version=7.2.6; version=7.2.7; version=7.2.8; version=7.2.8.1; version=7.2.9; version=7.3.0; version=7.3.1; version=7.3.1.1; version=7.3.1.2; version=7.4.0; version=7.4.1; version=7.4.1.1; version=7.4.2; version=7.4.2.1; version=7.6.0

Published CVSS scores

8.6CiscoCVSS:3.1/AV:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-680Integer Overflow to Buffer Overflow
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

See the directory against your own environment.

Your stack

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