CVE-2025-20333Known exploitationNetwork attack vector

Authenticated root code execution via unchecked HTTP input

Published Sep 25, 2025 · Updated Sep 25, 2025

Buffer overflow in the VPN web server of Cisco Secure Firewall ASA and FTD Software allows remote authenticated users to execute code as root. The VPN web server fails to enforce an input-length bound before copying request data, but Cisco has not identified the affected endpoint or function. Valid VPN user credentials and a configured SSL listen socket are required; exploitation grants root control of the affected device.

CVSS severity9.9
Critical
EPSS probability70.65%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Buffer overflow in the VPN web server of Cisco Secure Firewall ASA and FTD Software allows remote authenticated users to execute code as root. The VPN web server fails to enforce an input-length bound before copying request data, but Cisco has not identified the affected endpoint or function. Valid VPN user credentials and a configured SSL listen socket are required; exploitation grants root control of the affected device.

The record

CVE
CVE-2025-20333
Published
Sep 25, 2025
Updated
Sep 25, 2025
Vendor
ClamAV
Product
Cisco Adaptive Security Appliance (ASA) Software
Classifications
CWE-120, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 25, 2025Exploitation reportedCISA Known Exploited Vulnerabilities Catalog entry
  2. Sep 25, 2025CVE publishedPublication date reported by the CVE source.
  3. Sep 25, 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=9.16.4.82
  104. Affected versionversion=9.16.4.84
  105. Affected versionversion=9.16.4.9
  106. Affected versionversion=9.17.1
  107. Affected versionversion=9.17.1.10
  108. Affected versionversion=9.17.1.11
  109. Affected versionversion=9.17.1.13
  110. Affected versionversion=9.17.1.15
  111. Affected versionversion=9.17.1.20
  112. Affected versionversion=9.17.1.30
  113. Affected versionversion=9.17.1.33
  114. Affected versionversion=9.17.1.39
  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=9.18.4.5
  136. Affected versionversion=9.18.4.8
  137. Affected versionversion=9.19.1
  138. Affected versionversion=9.19.1.12
  139. Affected versionversion=9.19.1.18
  140. Affected versionversion=9.19.1.22
  141. Affected versionversion=9.19.1.24
  142. Affected versionversion=9.19.1.27
  143. Affected versionversion=9.19.1.28
  144. Affected versionversion=9.19.1.31
  145. Affected versionversion=9.19.1.5
  146. Affected versionversion=9.19.1.9
  147. Affected versionversion=9.20.1
  148. Affected versionversion=9.20.1.5
  149. Affected versionversion=9.20.2
  150. Affected versionversion=9.20.2.10
  151. Affected versionversion=9.20.2.21
  152. Affected versionversion=9.20.2.22
  153. Affected versionversion=9.20.3
  154. Affected versionversion=9.20.3.4
  155. Affected versionversion=9.22.1.1
  156. Affected versionversion=9.22.1.2
  157. Affected versionversion=9.8.1
  158. Affected versionversion=9.8.1.5
  159. Affected versionversion=9.8.1.7
  160. Affected versionversion=9.8.2
  161. Affected versionversion=9.8.2.14
  162. Affected versionversion=9.8.2.15
  163. Affected versionversion=9.8.2.17
  164. Affected versionversion=9.8.2.20
  165. Affected versionversion=9.8.2.24
  166. Affected versionversion=9.8.2.26
  167. Affected versionversion=9.8.2.28
  168. Affected versionversion=9.8.2.33
  169. Affected versionversion=9.8.2.35
  170. Affected versionversion=9.8.2.38
  171. Affected versionversion=9.8.2.45
  172. Affected versionversion=9.8.2.8
  173. Affected versionversion=9.8.3
  174. Affected versionversion=9.8.3.11
  175. Affected versionversion=9.8.3.14
  176. Affected versionversion=9.8.3.16
  177. Affected versionversion=9.8.3.18
  178. Affected versionversion=9.8.3.21
  179. Affected versionversion=9.8.3.26
  180. Affected versionversion=9.8.3.29
  181. Affected versionversion=9.8.3.8
  182. Affected versionversion=9.8.4
  183. Affected versionversion=9.8.4.10
  184. Affected versionversion=9.8.4.12
  185. Affected versionversion=9.8.4.15
  186. Affected versionversion=9.8.4.17
  187. Affected versionversion=9.8.4.20
  188. Affected versionversion=9.8.4.22
  189. Affected versionversion=9.8.4.25
  190. Affected versionversion=9.8.4.26
  191. Affected versionversion=9.8.4.29
  192. Affected versionversion=9.8.4.3
  193. Affected versionversion=9.8.4.32
  194. Affected versionversion=9.8.4.33
  195. Affected versionversion=9.8.4.34
  196. Affected versionversion=9.8.4.35
  197. Affected versionversion=9.8.4.39
  198. Affected versionversion=9.8.4.40
  199. Affected versionversion=9.8.4.41
  200. Affected versionversion=9.8.4.43
  201. Affected versionversion=9.8.4.44
  202. Affected versionversion=9.8.4.45
  203. Affected versionversion=9.8.4.46
  204. Affected versionversion=9.8.4.48
  205. Affected versionversion=9.8.4.7
  206. Affected versionversion=9.8.4.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

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=9.16.4.82; version=9.16.4.84; 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=9.17.1.7; 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=9.18.4.5; 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=9.19.1.5; 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=9.20.3.4; version=9.22.1.1; version=9.22.1.2; 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=7.0.8; 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=7.3.0; 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=7.4.2.2; version=7.4.2.3; version=7.6.0

Published CVSS scores

9.9Cisco Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

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
Privilegesauthenticated
Known exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1190Exploit Public-Facing Application

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.

Reported exploitation

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo