CVE-2026-20186

Severity

CRITICAL

CVSS

9.9

EPSS

0.06315

Risk score

41.81

CISA KEV

PoC

Published

2026-04-15

Modified

2026-04-16

First seen

2026-08-06

Aliases

CNVD-2026-21836, EUVD-2026-22973, GHSA-4W7Q-F6RR-2P4R

Products

Cisco Cisco Identity Services Engine Software 3.1.0, Cisco Cisco Identity Services Engine Software 3.1.0 p1, Cisco Cisco Identity Services Engine Software 3.1.0 p10, Cisco Cisco Identity Services Engine Software 3.1.0 p2, Cisco Cisco Identity Services Engine Software 3.1.0 p3, Cisco Cisco Identity Services Engine Software 3.1.0 p4, Cisco Cisco Identity Services Engine Software 3.1.0 p5, Cisco Cisco Identity Services Engine Software 3.1.0 p6, Cisco Cisco Identity Services Engine Software 3.1.0 p7, Cisco Cisco Identity Services Engine Software 3.1.0 p8, Cisco Cisco Identity Services Engine Software 3.1.0 p9, Cisco Cisco Identity Services Engine Software 3.2.0, Cisco Cisco Identity Services Engine Software 3.2.0 p1, Cisco Cisco Identity Services Engine Software 3.2.0 p2, Cisco Cisco Identity Services Engine Software 3.2.0 p3, Cisco Cisco Identity Services Engine Software 3.2.0 p4, Cisco Cisco Identity Services Engine Software 3.2.0 p5, Cisco Cisco Identity Services Engine Software 3.2.0 p6, Cisco Cisco Identity Services Engine Software 3.2.0 p7, Cisco Cisco Identity Services Engine Software 3.3 Patch 1, Cisco Cisco Identity Services Engine Software 3.3 Patch 2, Cisco Cisco Identity Services Engine Software 3.3 Patch 3, Cisco Cisco Identity Services Engine Software 3.3 Patch 4, Cisco Cisco Identity Services Engine Software 3.3 Patch 5, Cisco Cisco Identity Services Engine Software 3.3 Patch 6, Cisco Cisco Identity Services Engine Software 3.3 Patch 7, Cisco Cisco Identity Services Engine Software 3.3.0, Cisco Cisco Identity Services Engine Software 3.4 Patch 1, Cisco Cisco Identity Services Engine Software 3.4 Patch 2, Cisco Cisco Identity Services Engine Software 3.4 Patch 3, Cisco Cisco Identity Services Engine Software 3.4.0, Cisco:Cisco Identity Services Engine Software 3.1.0, Cisco:Cisco Identity Services Engine Software 3.1.0 p1, Cisco:Cisco Identity Services Engine Software 3.1.0 p10, Cisco:Cisco Identity Services Engine Software 3.1.0 p2, Cisco:Cisco Identity Services Engine Software 3.1.0 p3, Cisco:Cisco Identity Services Engine Software 3.1.0 p4, Cisco:Cisco Identity Services Engine Software 3.1.0 p5, Cisco:Cisco Identity Services Engine Software 3.1.0 p6, Cisco:Cisco Identity Services Engine Software 3.1.0 p7, Cisco:Cisco Identity Services Engine Software 3.1.0 p8, Cisco:Cisco Identity Services Engine Software 3.1.0 p9, Cisco:Cisco Identity Services Engine Software 3.2.0, Cisco:Cisco Identity Services Engine Software 3.2.0 p1, Cisco:Cisco Identity Services Engine Software 3.2.0 p2, Cisco:Cisco Identity Services Engine Software 3.2.0 p3, Cisco:Cisco Identity Services Engine Software 3.2.0 p4, Cisco:Cisco Identity Services Engine Software 3.2.0 p5, Cisco:Cisco Identity Services Engine Software 3.2.0 p6, Cisco:Cisco Identity Services Engine Software 3.2.0 p7, Cisco:Cisco Identity Services Engine Software 3.3 Patch 1, Cisco:Cisco Identity Services Engine Software 3.3 Patch 2, Cisco:Cisco Identity Services Engine Software 3.3 Patch 3, Cisco:Cisco Identity Services Engine Software 3.3 Patch 4, Cisco:Cisco Identity Services Engine Software 3.3 Patch 5, Cisco:Cisco Identity Services Engine Software 3.3 Patch 6, Cisco:Cisco Identity Services Engine Software 3.3 Patch 7, Cisco:Cisco Identity Services Engine Software 3.3.0, Cisco:Cisco Identity Services Engine Software 3.4 Patch 1, Cisco:Cisco Identity Services Engine Software 3.4 Patch 2, Cisco:Cisco Identity Services Engine Software 3.4 Patch 3, Cisco:Cisco Identity Services Engine Software 3.4.0

Sources

cnvd CNVD-2026-21836
euvd EUVD-2026-22973

Description

A vulnerability in Cisco Identity Services Engine (ISE) 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 at least Read Only Admin 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 these vulnerabilities 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.

Description

References