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Vulnerabilities

Vulnerability · CVE-2026-20147

ZDI-26-581: Cisco Identity Services Engine invokeScript Command Injection Remote Code Execution Vulnerability

Published Apr 15, 2026 · catalog updated Sep 25, 2026 · identity services engine passive identity connector

Check this week

CVE-2026-20147 is not in CISA KEV. FIRST estimates a 10.38% chance of exploitation in the next 30 days. Check whether you run identity services engine passive identity connector.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
10.38%
Remediation
Advisory link
Affected products
cpe cisco/identity services engine · cpe cisco/identity services engine passive identity connector

A vulnerability in Cisco ISE and Cisco ISE-PIC could allow an authenticated, remote attacker to execute arbitrary commands on the underlying operating system of an affected device. To exploit this vulnerability, the attacker must have valid administrative credentials. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to obtain user-level access to the underlying operating system and then elevate privileges to root. In single-node ISE deployments, successful exploitation of this vulnerability could cause the affected ISE node to become unavailable, resulting in a denial of service (DoS) condition. In that condition, endpoints that have not already authenticated would be unable to access the network until the node is restored.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe cisco/identity services engineversion unspecified
  • cpe cisco/identity services engine passive identity connector3.1.0

How to fix CVE-2026-20147

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2026-20147 is not in CISA KEV. FIRST estimates a 10.38% chance of exploitation in the next 30 days. Check whether you run identity services engine passive identity connector.

Which versions are affected?

Compare what you have installed with cisco/identity services engine passive identity connector 3.1.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-77: Command Injection. EPSS 10.38%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Cisco security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 13, 2026 · Catalog

    Detected

    This vulnerability allows remote attackers to execute arbitrary code on affected installations of Cisco Identity Services Engine. Authentication is required to exploit this vulnerability. The ZDI has assigned a CVSS rating of 7.2. The following CVEs are assigned: CVE-2026-20147.

  2. Sep 25, 2026 · NIST NVD

    Updated

    A vulnerability in Cisco ISE and Cisco ISE-PIC could allow an authenticated, remote attacker to execute arbitrary commands on the underlying operating system of an affected device. To exploit this vulnerability, the attacker must have valid administrative credentials. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sendin

Sources

  • CVE.orgVulnerability recordCVE-2026-20147

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-20147

    30-day exploitation probability 10.4%

    first.org
  • NIST NVDVulnerability recordCVE-2026-20147

    A vulnerability in Cisco ISE and Cisco ISE-PIC could allow an authenticated, remote attacker to execute arbitrary commands on the underlying operating system of an affected device. To exploit this vulnerability, the attacker must have valid administrative credentials. This vul

    nvd.nist.gov
  • Zero Day InitiativeCoordinated disclosureZDI-26-581

    This vulnerability allows remote attackers to execute arbitrary code on affected installations of Cisco Identity Services Engine. Authentication is required to exploit this vulnerability. The ZDI has assigned a CVSS rating of 7.2. The following CVEs are assigned: CVE-2026-20147.

    zerodayinitiative.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.