CVE-2026-20305 is a vulnerability in Cisco Identity Services Engine Software
Published on September 16, 2026
Cisco Identity Services Engine Command Injection Vulnerability
A vulnerability in the diagnostic tools of Cisco ISE and ISE-PIC could allow an authenticated, remote attacker to perform command injection attacks on the underlying operating system and elevate privileges to root. To exploit this vulnerability, the attacker must have valid administrative credentials.
This vulnerability is due to improper validation of user-supplied input. An attacker could exploit this vulnerability by sending crafted commands to the web-based management interface of an affected device. A successful exploit could allow the attacker to execute arbitrary code on the device and 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.
Vulnerability Analysis
CVE-2026-20305 can be exploited with network access, and requires user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.
Weakness Type
What is a Shell injection Vulnerability?
The software constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.
CVE-2026-20305 has been classified to as a Shell injection vulnerability or weakness.
Products Associated with CVE-2026-20305
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Affected Versions
Cisco Identity Services Engine Software:- Version 3.1.0 is affected.
- Version 3.1.0 p1 is affected.
- Version 3.1.0 p3 is affected.
- Version 3.1.0 p2 is affected.
- Version 3.2.0 is affected.
- Version 3.1.0 p4 is affected.
- Version 3.1.0 p5 is affected.
- Version 3.2.0 p1 is affected.
- Version 3.1.0 p6 is affected.
- Version 3.2.0 p2 is affected.
- Version 3.1.0 p7 is affected.
- Version 3.3.0 is affected.
- Version 3.2.0 p3 is affected.
- Version 3.2.0 p4 is affected.
- Version 3.1.0 p8 is affected.
- Version 3.2.0 p5 is affected.
- Version 3.2.0 p6 is affected.
- Version 3.1.0 p9 is affected.
- Version 3.3 Patch 2 is affected.
- Version 3.3 Patch 1 is affected.
- Version 3.3 Patch 3 is affected.
- Version 3.4.0 is affected.
- Version 3.2.0 p7 is affected.
- Version 3.3 Patch 4 is affected.
- Version 3.4 Patch 1 is affected.
- Version 3.1.0 p10 is affected.
- Version 3.3 Patch 5 is affected.
- Version 3.3 Patch 6 is affected.
- Version 3.4 Patch 2 is affected.
- Version 3.3 Patch 7 is affected.
- Version 3.4 Patch 3 is affected.
- Version 3.5.0 is affected.
- Version 3.4 Patch 4 is affected.
- Version 3.3 Patch 8 is affected.
- Version 3.2 Patch 8 is affected.
- Version 3.5 Patch 1 is affected.
- Version 3.3 Patch 9 is affected.
- Version 3.2 Patch 9 is affected.
- Version 3.4 Patch 5 is affected.
- Version 3.5 Patch 3 is affected.
- Version 3.5 Patch 2 is affected.
- Version 3.3 Patch 10 is affected.
- Version 3.3 Patch 11 is affected.
- Version 3.4 Patch 6 is affected.
- Version 3.2 Patch 10 is affected.
- Version 3.1.0 p72 is affected.
- Version 3.1.0 p11 is affected.
- Version 3.2.0 is affected.
- Version 3.1.0 is affected.
- Version 3.3.0 is affected.
- Version 3.4.0 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.