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Vulnerability Detail

CVE-2026-20211UPDATED Verified Sceawere Triage Sources: NVD / CISA KEV

Vulnerability Metadata

Severity
Critical
Score / CVSS
9.1
Creation Date
1d ago
Vendor
Cisco
Product
Cisco Identity Services Engine Software
Attack Type
Deserialization of Untrusted Data
Vector String
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Attack Complexity
LOW

Narrative and Response

Description

A vulnerability in Cisco 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 valid high-privileged administrative credentials. This vulnerability is due to insecure deserialization of Java objects by the affected software. An attacker could exploit this vulnerability by sending a crafted serialized Java object 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 DoS condition. In that condition, endpoints that have not already authenticated would be unable to access the network until the node is restored.

Executive Summary

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Technical Details

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Mitigations

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Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

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References

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Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

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Additional Metadata

{
  "score": "9.1",
  "pubDate": "2026-09-16T20:17:22.200Z",
  "pubdate": "2026-09-16T20:17:22.200Z"
}
CVE-2026-20211: CVE-2026-20211 Vulnerability (CRITICAL Severity, CVSS: 9.1) | Sceawere