CVE-2026-20147Network attack vector

Administrative code execution via invokeScript system call

Published Apr 15, 2026 · Updated Apr 15, 2026

Command injection in Cisco ISE and ISE-PIC affected releases allows remote authenticated users to execute operating-system commands. The invokeScript method passes a user-supplied string to a system call without proper validation after receiving a crafted HTTP request. Valid administrative credentials are required; execution begins as iseadminportal, can reach root, and can interrupt a single-node deployment.

CVSS severity9.9
Critical
EPSS probability10.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in Cisco ISE and ISE-PIC affected releases allows remote authenticated users to execute operating-system commands. The invokeScript method passes a user-supplied string to a system call without proper validation after receiving a crafted HTTP request. Valid administrative credentials are required; execution begins as iseadminportal, can reach root, and can interrupt a single-node deployment.

The record

CVE
CVE-2026-20147
Published
Apr 15, 2026
Updated
Apr 15, 2026
Vendor
ClamAV
Product
Cisco Identity Services Engine
Classifications
CWE-77, T1059
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 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=3.1.0
  2. Affected versionversion=3.1.0 p1
  3. Affected versionversion=3.1.0 p10
  4. Affected versionversion=3.1.0 p2
  5. Affected versionversion=3.1.0 p3
  6. Affected versionversion=3.1.0 p4
  7. Affected versionversion=3.1.0 p5
  8. Affected versionversion=3.1.0 p6
  9. Affected versionversion=3.1.0 p7
  10. Affected versionversion=3.1.0 p8
  11. Affected versionversion=3.1.0 p9
  12. Affected versionversion=3.2.0
  13. Affected versionversion=3.2.0 p1
  14. Affected versionversion=3.2.0 p2
  15. Affected versionversion=3.2.0 p3
  16. Affected versionversion=3.2.0 p4
  17. Affected versionversion=3.2.0 p5
  18. Affected versionversion=3.2.0 p6
  19. Affected versionversion=3.2.0 p7
  20. Affected versionversion=3.2 Patch 8
  21. Affected versionversion=3.2 Patch 9
  22. Affected versionversion=3.3.0
  23. Affected versionversion=3.3 Patch 1
  24. Affected versionversion=3.3 Patch 2
  25. Affected versionversion=3.3 Patch 3
  26. Affected versionversion=3.3 Patch 4
  27. Affected versionversion=3.3 Patch 5
  28. Affected versionversion=3.3 Patch 6
  29. Affected versionversion=3.3 Patch 7
  30. Affected versionversion=3.3 Patch 8
  31. Affected versionversion=3.3 Patch 9
  32. Affected versionversion=3.4.0
  33. Affected versionversion=3.4 Patch 1
  34. Affected versionversion=3.4 Patch 2
  35. Affected versionversion=3.4 Patch 3
  36. Affected versionversion=3.4 Patch 4
  37. Affected versionversion=3.4 Patch 5
  38. Affected versionversion=3.5.0
  39. Affected versionversion=3.5 Patch 1
  40. Affected versionversion=3.5 Patch 2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

ClamAV · Cisco Identity Services Engineversion=3.1.0; version=3.1.0 p1; version=3.1.0 p10; version=3.1.0 p2; version=3.1.0 p3; version=3.1.0 p4; version=3.1.0 p5; version=3.1.0 p6; version=3.1.0 p7; version=3.1.0 p8; version=3.1.0 p9; version=3.2.0; version=3.2.0 p1; version=3.2.0 p2; version=3.2.0 p3; version=3.2.0 p4; version=3.2.0 p5; version=3.2.0 p6; version=3.2.0 p7; version=3.2 Patch 8; version=3.2 Patch 9; version=3.3.0; version=3.3 Patch 1; version=3.3 Patch 2; version=3.3 Patch 3; version=3.3 Patch 4; version=3.3 Patch 5; version=3.3 Patch 6; version=3.3 Patch 7; version=3.3 Patch 8; version=3.3 Patch 9; version=3.4.0; version=3.4 Patch 1; version=3.4 Patch 2; version=3.4 Patch 3; version=3.4 Patch 4; version=3.4 Patch 5; version=3.5.0; version=3.5 Patch 1; version=3.5 Patch 2
ClamAV · Cisco ISE Passive Identity Connectorversion=3.1.0; version=3.2.0; version=3.3.0; version=3.4.0

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059Command and Scripting Interpreter

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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