CVE-2026-20136

Root privilege escalation via unvalidated CLI input

Published Apr 15, 2026 · Updated Apr 15, 2026

Command injection in the CLI of Cisco Identity Services Engine allows local users to execute operating-system commands as root through crafted input. A specific CLI command insufficiently validates user-supplied input before passing it to the underlying operating system; Cisco has not disclosed the command name or parsing path. Exploitation requires local administrative CLI access and grants root privileges, enabling data access and modification without a reported service interruption.

CVSS severity6.0
Medium
EPSS probability0.50%
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 the CLI of Cisco Identity Services Engine allows local users to execute operating-system commands as root through crafted input. A specific CLI command insufficiently validates user-supplied input before passing it to the underlying operating system; Cisco has not disclosed the command name or parsing path. Exploitation requires local administrative CLI access and grants root privileges, enabling data access and modification without a reported service interruption.

The record

CVE
CVE-2026-20136
Published
Apr 15, 2026
Updated
Apr 15, 2026
Vendor
ClamAV
Product
Cisco Identity Services Engine
Classifications
CWE-116, T1059
Attack vector
local
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

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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 10
  25. Affected versionversion=3.3 Patch 2
  26. Affected versionversion=3.3 Patch 3
  27. Affected versionversion=3.3 Patch 4
  28. Affected versionversion=3.3 Patch 5
  29. Affected versionversion=3.3 Patch 6
  30. Affected versionversion=3.3 Patch 7
  31. Affected versionversion=3.3 Patch 8
  32. Affected versionversion=3.3 Patch 9
  33. Affected versionversion=3.4.0
  34. Affected versionversion=3.4 Patch 1
  35. Affected versionversion=3.4 Patch 2
  36. Affected versionversion=3.4 Patch 3
  37. Affected versionversion=3.4 Patch 4
  38. Affected versionversion=3.4 Patch 5
  39. Affected versionversion=3.5.0
  40. Affected versionversion=3.5 Patch 1
  41. Affected versionversion=3.5 Patch 2

What conditions does exploitation require?

Attack vectorlocal
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 10; 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

Published CVSS scores

6.0Cisco Systems, Inc.CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/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)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-116Improper Encoding or Escaping of Output
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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