CVE-2022-20713Public exploitNetwork attack vector

Browser script execution via ignored POST bodies

Published Aug 10, 2022 · Updated Sep 16, 2024

Client-side request smuggling in Cisco ASA and FTD VPN web services allows remote attackers to execute script in users' browsers. The service responds to POST requests without consuming the declared body, then reuses the HTTP/1.1 connection so body bytes prefix the next request. Exploitation requires enabled AnyConnect or Clientless SSL VPN endpoints and user interaction; browser content is affected, but the appliance is not directly affected.

CVSS severity4.3
Medium
EPSS probability1.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Client-side request smuggling in Cisco ASA and FTD VPN web services allows remote attackers to execute script in users' browsers. The service responds to POST requests without consuming the declared body, then reuses the HTTP/1.1 connection so body bytes prefix the next request. Exploitation requires enabled AnyConnect or Clientless SSL VPN endpoints and user interaction; browser content is affected, but the appliance is not directly affected.

The record

CVE
CVE-2022-20713
Published
Aug 10, 2022
Updated
Sep 16, 2024
Vendor
ClamAV
Product
Cisco Adaptive Security Appliance (ASA) Software
Classifications
CWE-444, CAPEC-33, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 10, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record 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=9.12.4.7
  39. Affected versionversion=9.12.4.8
  40. Affected versionversion=9.14.1
  41. Affected versionversion=9.14.1.10
  42. Affected versionversion=9.14.1.15
  43. Affected versionversion=9.14.1.19
  44. Affected versionversion=9.14.1.30
  45. Affected versionversion=9.14.1.6
  46. Affected versionversion=9.14.2
  47. Affected versionversion=9.14.2.13
  48. Affected versionversion=9.14.2.15
  49. Affected versionversion=9.14.2.4
  50. Affected versionversion=9.14.2.8
  51. Affected versionversion=9.14.3
  52. Affected versionversion=9.14.3.1
  53. Affected versionversion=9.14.3.11
  54. Affected versionversion=9.14.3.13
  55. Affected versionversion=9.14.3.15
  56. Affected versionversion=9.14.3.18
  57. Affected versionversion=9.14.3.9
  58. Affected versionversion=9.14.4
  59. Affected versionversion=9.14.4.12
  60. Affected versionversion=9.14.4.13
  61. Affected versionversion=9.14.4.14
  62. Affected versionversion=9.14.4.15
  63. Affected versionversion=9.14.4.17
  64. Affected versionversion=9.14.4.22
  65. Affected versionversion=9.14.4.23
  66. Affected versionversion=9.14.4.6
  67. Affected versionversion=9.14.4.7
  68. Affected versionversion=9.15.1
  69. Affected versionversion=9.15.1.1
  70. Affected versionversion=9.15.1.10
  71. Affected versionversion=9.15.1.15
  72. Affected versionversion=9.15.1.16
  73. Affected versionversion=9.15.1.17
  74. Affected versionversion=9.15.1.21
  75. Affected versionversion=9.15.1.7
  76. Affected versionversion=9.16.1
  77. Affected versionversion=9.16.1.28
  78. Affected versionversion=9.16.2
  79. Affected versionversion=9.16.2.11
  80. Affected versionversion=9.16.2.13
  81. Affected versionversion=9.16.2.14
  82. Affected versionversion=9.16.2.3
  83. Affected versionversion=9.16.2.7
  84. Affected versionversion=9.16.3
  85. Affected versionversion=9.16.3.14
  86. Affected versionversion=9.16.3.15
  87. Affected versionversion=9.16.3.19
  88. Affected versionversion=9.16.3.23
  89. Affected versionversion=9.16.3.3
  90. Affected versionversion=9.16.4
  91. Affected versionversion=9.16.4.14
  92. Affected versionversion=9.16.4.18
  93. Affected versionversion=9.16.4.19
  94. Affected versionversion=9.16.4.27
  95. Affected versionversion=9.16.4.9
  96. Affected versionversion=9.17.1
  97. Affected versionversion=9.17.1.10
  98. Affected versionversion=9.17.1.11
  99. Affected versionversion=9.17.1.13
  100. Affected versionversion=9.17.1.15
  101. Affected versionversion=9.17.1.20
  102. Affected versionversion=9.17.1.30
  103. Affected versionversion=9.17.1.7
  104. Affected versionversion=9.17.1.9
  105. Affected versionversion=9.18.1
  106. Affected versionversion=9.18.1.3
  107. Affected versionversion=9.18.2
  108. Affected versionversion=9.18.2.5
  109. Affected versionversion=9.18.2.7
  110. Affected versionversion=9.18.2.8
  111. Affected versionversion=9.18.3
  112. Affected versionversion=9.18.3.39
  113. Affected versionversion=9.18.3.46
  114. Affected versionversion=9.19.1
  115. Affected versionversion=9.19.1.12
  116. Affected versionversion=9.19.1.5
  117. Affected versionversion=9.19.1.9
  118. Affected versionversion=9.8.1
  119. Affected versionversion=9.8.1.5
  120. Affected versionversion=9.8.1.7
  121. Affected versionversion=9.8.2
  122. Affected versionversion=9.8.2.14
  123. Affected versionversion=9.8.2.15
  124. Affected versionversion=9.8.2.17
  125. Affected versionversion=9.8.2.20
  126. Affected versionversion=9.8.2.24
  127. Affected versionversion=9.8.2.26
  128. Affected versionversion=9.8.2.28
  129. Affected versionversion=9.8.2.33
  130. Affected versionversion=9.8.2.35
  131. Affected versionversion=9.8.2.38
  132. Affected versionversion=9.8.2.8
  133. Affected versionversion=9.8.3
  134. Affected versionversion=9.8.3.11
  135. Affected versionversion=9.8.3.14
  136. Affected versionversion=9.8.3.16
  137. Affected versionversion=9.8.3.18
  138. Affected versionversion=9.8.3.21
  139. Affected versionversion=9.8.3.26
  140. Affected versionversion=9.8.3.29
  141. Affected versionversion=9.8.3.8
  142. Affected versionversion=9.8.4
  143. Affected versionversion=9.8.4.10
  144. Affected versionversion=9.8.4.12
  145. Affected versionversion=9.8.4.15
  146. Affected versionversion=9.8.4.17
  147. Affected versionversion=9.8.4.20
  148. Affected versionversion=9.8.4.22
  149. Affected versionversion=9.8.4.25
  150. Affected versionversion=9.8.4.26
  151. Affected versionversion=9.8.4.29
  152. Affected versionversion=9.8.4.3
  153. Affected versionversion=9.8.4.32
  154. Affected versionversion=9.8.4.33
  155. Affected versionversion=9.8.4.34
  156. Affected versionversion=9.8.4.35
  157. Affected versionversion=9.8.4.39
  158. Affected versionversion=9.8.4.40
  159. Affected versionversion=9.8.4.41
  160. Affected versionversion=9.8.4.43
  161. Affected versionversion=9.8.4.44
  162. Affected versionversion=9.8.4.45
  163. Affected versionversion=9.8.4.46
  164. Affected versionversion=9.8.4.48
  165. Affected versionversion=9.8.4.7
  166. 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=9.12.4.7; 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=9.14.4.6; version=9.14.4.7; version=9.15.1; version=9.15.1.1; version=9.15.1.10; version=9.15.1.15; version=9.15.1.16; version=9.15.1.17; version=9.15.1.21; version=9.15.1.7; 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=9.16.4.9; 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=9.17.1.7; 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=9.19.1; version=9.19.1.12; version=9.19.1.5; version=9.19.1.9; 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=9.8.2.8; 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 Defense Softwareversion=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=6.4.0.2; 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=6.7.0; version=6.7.0.1; version=6.7.0.2; version=6.7.0.3; 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=7.1.0; 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=7.3.0; version=7.3.1; version=7.3.1.1

Published CVSS scores

4.3CiscoCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
CAPEC-33HTTP Request Smuggling
T1190Exploit Public-Facing Application

Public exploit references

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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