CVE-2026-20180 Cisco CVE debrief

Who should care

Administrators and security teams managing Cisco Identity Services Engine (ISE) deployments, especially those with versions prior to 3.2.0 patch 7, 3.3.0 patch 7, or 3.4.0 patch 3, should prioritize patching to mitigate the risk of remote code execution and denial of service.

Technical summary

CVE-2026-20180 is a critical remote code execution (RCE) vulnerability in Cisco Identity Services Engine (ISE). It requires authenticated access with at least Read Only Admin credentials. The vulnerability stems from insufficient validation of user-supplied input in HTTP requests. Successful exploitation allows attackers to execute arbitrary commands on the underlying operating system, potentially leading to user-level access and privilege escalation to root. In single-node deployments, this could result in a denial of service (DoS) condition, preventing unauthenticated endpoints from accessing the network. The CVSS score is 9.9, classified as CRITICAL.

Defensive priority

High

Recommended defensive actions

• Apply patches or updates provided by Cisco to vulnerable ISE versions
• Restrict access to ISE management interfaces to trusted administrators
• Monitor ISE logs for suspicious activity
• Implement additional security measures such as network segmentation and least privilege access
• Conduct regular vulnerability assessments and penetration testing

Evidence notes

The CVE record was published on 2026-04-15T17:17:03.460Z and last modified on 2026-07-08T14:24:46.213Z. The NVD entry is currently Analyzed. Evidence is limited to public sources and may not reflect all affected systems or potential attack vectors. Defenders should verify system configurations, review logs for suspicious activity, and ensure patches are applied according to vendor guidance. Additional verification steps may be necessary to confirm vulnerability presence and validate mitigation efforts.

Official resources