CVE-2026-20186Network attack vector

Authenticated command injection via crafted HTTP request

Published Apr 15, 2026 · Updated Apr 15, 2026

Command injection in Cisco Identity Services Engine 3.4 Patch 3 and earlier allows remote authenticated users to execute OS commands. The web interface passes insufficiently validated HTTP-request input into an operating-system command context; Cisco has not disclosed the handler or parameter. Read Only Admin credentials are required, and exploitation grants user-level access followed by root elevation and can interrupt a single-node deployment.

CVSS severity9.9
Critical
EPSS probability5.60%
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 Identity Services Engine 3.4 Patch 3 and earlier allows remote authenticated users to execute OS commands. The web interface passes insufficiently validated HTTP-request input into an operating-system command context; Cisco has not disclosed the handler or parameter. Read Only Admin credentials are required, and exploitation grants user-level access followed by root elevation and can interrupt a single-node deployment.

The record

CVE
CVE-2026-20186
Published
Apr 15, 2026
Updated
Apr 15, 2026
Vendor
ClamAV
Product
Cisco Identity Services Engine
Classifications
CWE-77, T1059
Attack vector
network
Privileges
authenticated

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=3.3.0
  21. Affected versionversion=3.3 Patch 1
  22. Affected versionversion=3.3 Patch 2
  23. Affected versionversion=3.3 Patch 3
  24. Affected versionversion=3.3 Patch 4
  25. Affected versionversion=3.3 Patch 5
  26. Affected versionversion=3.3 Patch 6
  27. Affected versionversion=3.3 Patch 7
  28. Affected versionversion=3.4.0
  29. Affected versionversion=3.4 Patch 1
  30. Affected versionversion=3.4 Patch 2
  31. Affected versionversion=3.4 Patch 3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

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=3.3.0; 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=3.4.0; version=3.4 Patch 1; version=3.4 Patch 2; version=3.4 Patch 3

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
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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