CVE-2023-20232Network attack vector

Web cache poisoning via malformed API requests

Published Aug 16, 2023 · Updated Aug 2, 2024

Web cache poisoning in Cisco Unified Contact Center Express before 12.5(1)SU03 ES02 allows remote attackers to redirect users. The Tomcat implementation improperly validates crafted HTTP requests sent to a specific Finesse Portal API endpoint, causing the internal WebProxy to use an attacker-controlled host. Exploitation requires a third-party web application that uses Unified CCX APIs; the Finesse desktop web application is not exposed.

CVSS severity5.3
Medium
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Web cache poisoning in Cisco Unified Contact Center Express before 12.5(1)SU03 ES02 allows remote attackers to redirect users. The Tomcat implementation improperly validates crafted HTTP requests sent to a specific Finesse Portal API endpoint, causing the internal WebProxy to use an attacker-controlled host. Exploitation requires a third-party web application that uses Unified CCX APIs; the Finesse desktop web application is not exposed.

The record

CVE
CVE-2023-20232
Published
Aug 16, 2023
Updated
Aug 2, 2024
Vendor
ClamAV
Product
Cisco Unified Contact Center Express
Classifications
CWE-20, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 16, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=10.0(1)SU1
  2. Affected versionversion=10.0(1)SU1ES04
  3. Affected versionversion=10.5(1)
  4. Affected versionversion=10.5(1)SU1
  5. Affected versionversion=10.5(1)SU1ES10
  6. Affected versionversion=10.6(1)
  7. Affected versionversion=10.6(1)SU1
  8. Affected versionversion=10.6(1)SU2
  9. Affected versionversion=10.6(1)SU2ES04
  10. Affected versionversion=10.6(1)SU3
  11. Affected versionversion=10.6(1)SU3ES01
  12. Affected versionversion=10.6(1)SU3ES02
  13. Affected versionversion=10.6(1)SU3ES03
  14. Affected versionversion=11.0(1)SU1
  15. Affected versionversion=11.0(1)SU1ES02
  16. Affected versionversion=11.0(1)SU1ES03
  17. Affected versionversion=11.5(1)ES01
  18. Affected versionversion=11.5(1)SU1
  19. Affected versionversion=11.5(1)SU1ES01
  20. Affected versionversion=11.5(1)SU1ES02
  21. Affected versionversion=11.5(1)SU1ES03
  22. Affected versionversion=11.6(1)
  23. Affected versionversion=11.6(1)ES01
  24. Affected versionversion=11.6(1)ES02
  25. Affected versionversion=11.6(2)
  26. Affected versionversion=11.6(2)ES01
  27. Affected versionversion=11.6(2)ES02
  28. Affected versionversion=11.6(2)ES03
  29. Affected versionversion=11.6(2)ES04
  30. Affected versionversion=11.6(2)ES05
  31. Affected versionversion=11.6(2)ES06
  32. Affected versionversion=11.6(2)ES07
  33. Affected versionversion=11.6(2)ES08
  34. Affected versionversion=12.0(1)
  35. Affected versionversion=12.0(1)ES01
  36. Affected versionversion=12.0(1)ES02
  37. Affected versionversion=12.0(1)ES03
  38. Affected versionversion=12.0(1)ES04
  39. Affected versionversion=12.5(1)
  40. Affected versionversion=12.5(1)ES01
  41. Affected versionversion=12.5(1)ES02
  42. Affected versionversion=12.5(1)ES03
  43. Affected versionversion=12.5(1)_SU01_ES01
  44. Affected versionversion=12.5(1)_SU01_ES02
  45. Affected versionversion=12.5(1)_SU01_ES03
  46. Affected versionversion=12.5(1)_SU02_ES01
  47. Affected versionversion=12.5(1)_SU02_ES02
  48. Affected versionversion=12.5(1)_SU02_ES03
  49. Affected versionversion=12.5(1)_SU02_ES04
  50. Affected versionversion=12.5(1)_SU03_ES01
  51. Affected versionversion=12.5(1)SU1
  52. Affected versionversion=12.5(1)SU2
  53. Affected versionversion=12.5(1)SU3
  54. Affected versionversion=8.5(1)
  55. Affected versionversion=9.0(2)SU3ES04

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco Unified Contact Center Expressversion=10.0(1)SU1; version=10.0(1)SU1ES04; version=10.5(1); version=10.5(1)SU1; version=10.5(1)SU1ES10; version=10.6(1); version=10.6(1)SU1; version=10.6(1)SU2; version=10.6(1)SU2ES04; version=10.6(1)SU3; version=10.6(1)SU3ES01; version=10.6(1)SU3ES02; version=10.6(1)SU3ES03; version=11.0(1)SU1; version=11.0(1)SU1ES02; version=11.0(1)SU1ES03; version=11.5(1)ES01; version=11.5(1)SU1; version=11.5(1)SU1ES01; version=11.5(1)SU1ES02; version=11.5(1)SU1ES03; version=11.6(1); version=11.6(1)ES01; version=11.6(1)ES02; version=11.6(2); version=11.6(2)ES01; version=11.6(2)ES02; version=11.6(2)ES03; version=11.6(2)ES04; version=11.6(2)ES05; version=11.6(2)ES06; version=11.6(2)ES07; version=11.6(2)ES08; version=12.0(1); version=12.0(1)ES01; version=12.0(1)ES02; version=12.0(1)ES03; version=12.0(1)ES04; version=12.5(1); version=12.5(1)ES01; version=12.5(1)ES02; version=12.5(1)ES03; version=12.5(1)_SU01_ES01; version=12.5(1)_SU01_ES02; version=12.5(1)_SU01_ES03; version=12.5(1)_SU02_ES01; version=12.5(1)_SU02_ES02; version=12.5(1)_SU02_ES03; version=12.5(1)_SU02_ES04; version=12.5(1)_SU03_ES01; version=12.5(1)SU1; version=12.5(1)SU2; version=12.5(1)SU3; version=8.5(1); version=9.0(2)SU3ES04

Published CVSS scores

5.3NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
5.3Cisco Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
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.

Technologies

Your stack

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Your stack

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