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CVE-2026-20181

CRITICAL · CVSS 9.1EPSS 8.9%EU EUVD

A vulnerability in Cisco ISE and 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 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.

Key facts

CVSS score
9.1 (v3.1)
Severity
CRITICAL
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Weakness (CWE)
CWE-22
EPSS score
8.9% (95th percentile)
In CISA KEV
No
In EU EUVD
Yes (EUVD-2026-37748)
Published
June 17, 2026
NVD last modified
September 25, 2026
Status
Analyzed

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2026-37748 in the EU Vulnerability Database. Last updated in EUVD on June 18, 2026.

View on the EU Vulnerability Database

Affected products

  • cisco / identity services engine
  • cisco / identity services engine
  • cisco / identity services engine
  • cisco / identity services engine
  • cisco / identity services engine
  • cisco / identity services engine
  • cisco / identity services engine
  • cisco / identity services engine
  • cisco / identity services engine
  • cisco / identity services engine
  • cisco / identity services engine
  • cisco / identity services engine
  • cisco / identity services engine
  • cisco / identity services engine
  • cisco / identity services engine
  • cisco / identity services engine
  • cisco / identity services engine
  • cisco / identity services engine
  • cisco / identity services engine
  • cisco / identity services engine
  • cisco / identity services engine
  • cisco / identity services engine
  • cisco / identity services engine passive identity connector
  • cisco / identity services engine passive identity connector
  • cisco / identity services engine passive identity connector
  • cisco / identity services engine passive identity connector
  • cisco / identity services engine passive identity connector
  • cisco / identity services engine passive identity connector
  • cisco / identity services engine passive identity connector
  • cisco / identity services engine passive identity connector
  • cisco / identity services engine passive identity connector
  • cisco / identity services engine passive identity connector
  • cisco / identity services engine passive identity connector
  • cisco / identity services engine passive identity connector
  • cisco / identity services engine passive identity connector
  • cisco / identity services engine passive identity connector
  • cisco / identity services engine passive identity connector
  • cisco / identity services engine passive identity connector
  • cisco / identity services engine passive identity connector
  • cisco / identity services engine passive identity connector

Certified products that may be affected

1 FIPS 140 or Common Criteria certified product, from automated matching by sec-certs.org.

References

Last updated September 27, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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CVE-2026-20181: CRITICAL severity (CVSS 9.1)