CVE-2025-20276Network attack vector

Administrative code execution via Java object deserialization

Published Jun 4, 2025 · Updated Feb 26, 2026

Insecure deserialization in Cisco Unified Contact Center Express before 15.0(1) allows remote authenticated users to execute arbitrary code. The web management interface deserializes a crafted Java object supplied in a request, allowing attacker-controlled code to run on the underlying operating system. Valid administrative credentials are required; initial code runs as a low-privilege user, after which further actions can elevate privileges to root.

CVSS severity3.8
Low
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insecure deserialization in Cisco Unified Contact Center Express before 15.0(1) allows remote authenticated users to execute arbitrary code. The web management interface deserializes a crafted Java object supplied in a request, allowing attacker-controlled code to run on the underlying operating system. Valid administrative credentials are required; initial code runs as a low-privilege user, after which further actions can elevate privileges to root.

The record

CVE
CVE-2025-20276
Published
Jun 4, 2025
Updated
Feb 26, 2026
Vendor
ClamAV
Product
Cisco Unified Contact Center Express
Classifications
CWE-502, T1190
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jun 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2026Record 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)_SU03_ES02
  52. Affected versionversion=12.5(1)_SU03_ES03
  53. Affected versionversion=12.5(1)_SU03_ES04
  54. Affected versionversion=12.5(1)_SU03_ES05
  55. Affected versionversion=12.5(1)_SU03_ES06
  56. Affected versionversion=12.5(1)SU1
  57. Affected versionversion=12.5(1)SU2
  58. Affected versionversion=12.5(1)SU3
  59. Affected versionversion=8.5(1)
  60. Affected versionversion=9.0(2)SU3ES04

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

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)_SU03_ES02; version=12.5(1)_SU03_ES03; version=12.5(1)_SU03_ES04; version=12.5(1)_SU03_ES05; version=12.5(1)_SU03_ES06; 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

3.8Cisco Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
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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