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Vulnerabilities/CVE-2026-20186Public Intelligence Dossier
Source: cisco · Limited verification•Last verified: •Collection Running
CVE-2026-20186Unknown / EvaluatingCRITICAL (raw)CVSS 9.9CWE-77

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

Published: 15 Apr 2026•Last updated: 27 Oct 2026, 02:40 AM IST•Source identifier: psirt@cisco.com
Dossier completeness: source-provided sections 2 / 3 · rule guidance not available. Missing source facts count as incomplete.
Official source
CISA KEV catalog
Unknown
KEV status was not determined.
CVSS score
9.9CRITICAL (raw)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Metric sourcepsirt@cisco.com
EPSS probability
5.6%0.056
Percentile93rd
Weakness type
CWE-77
No further CWE recorded
Remediation
Patch status unknown
No fixed version or KB recorded

Why It Matters

Analysis dossier

Why It Matters

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.

SOC priority

High Severity / Review

Actively exploited (source statement)

Unknown

Publicly disclosed

Unknown

Risk basis: SOC ecosystem technology relevance; CRITICAL severity; Critical source severity without confirmed exploitation

Affected Products & Remediation

1 source-backed product
Affected products and versions (source)
  • cisco identity services engine · < 3.2.0; 3.2.0; 3.3.0; 3.4.0 · NVD CPE · Source
Recorded patch / KBNot provided by source

Vendor or catalog guidance (source)

Not provided by source

Known exploitation (source facts)

Only what a source states. Unknown means no source has said either way; it is not "not exploited".

CISA KEV
Unknown
Exploited (source statement)
Unknown
Publicly disclosed (source)
Unknown

Suggested hunting (rule-based inference)

SecOps Signal recommendation (rule-based inference). These steps are hunting hypotheses from the vulnerability class; they do not state or imply that exploitation occurred here or anywhere.

No rule-based guidance for this vulnerability class

CISA KEV Record

CISA KEV status was not determined for this record.

Change History & Source Data

— No recorded material change

CNA / source
psirt@cisco.com
Record status · verification
UPDATED · NVD API
CPE
cpe:2.3:a:cisco:identity_services_engine:*:*:*:*:*:*:*:*, cpe:2.3:a:cisco:identity_services_engine:3.2.0:-:*:*:*:*:*:*, cpe:2.3:a:cisco:identity_services_engine:3.2.0:patch1:*:*:*:*:*:*, cpe:2.3:a:cisco:identity_services_engine:3.2.0:patch2:*:*:*:*:*:*, cpe:2.3:a:cisco:identity_services_engine:3.2.0:patch3:*:*:*:*:*:*, cpe:2.3:a:cisco:identity_services_engine:3.2.0:patch4:*:*:*:*:*:*, cpe:2.3:a:cisco:identity_services_engine:3.2.0:patch5:*:*:*:*:*:*, cpe:2.3:a:cisco:identity_services_engine:3.2.0:patch6:*:*:*:*:*:*, cpe:2.3:a:cisco:identity_services_engine:3.2.0:patch7:*:*:*:*:*:*, cpe:2.3:a:cisco:identity_services_engine:3.3.0:-:*:*:*:*:*:*

Evidence & Provenance

2 public sources
sec.cloudapps.cisco.comSource recordnvd.nist.govSource record

Linked by the query's stored exact CVE association. Review required tables and validation status before use.

Detection Hunting Query
Target: DeviceTvmSoftwareVulnerabilities•Defender XDR
Detect endpoints exposed to CVE-2026-20186
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2026-20186
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2026-20186"| project DeviceId, DeviceName, OSPlatform, OSVersion, SoftwareVendor, SoftwareName, SoftwareVersion, CveId, VulnerabilitySeverityLevel, RecommendedSecurityUpdate, RecommendedSecurityUpdateId| sort by VulnerabilitySeverityLevel desc
Schema Checked · Not runtime validatedSource: SecOps Signal deterministic template · Limited verificationStatic screening: Passed structure and schema checks; tenant execution is not verified.
Open KQL Library

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Correlated briefings

SecOps Signal surfaces public advisory facts only. A missing value means the source has not published it, not that your environment is unaffected. No tenant inventory is connected.