Cisco Identity Services Engine RADIUS Denial of Service Vulnerability (CVE-2026-20352) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-20352

Cisco Identity Services Engine RADIUS Denial of Service Vulnerability

Answer in brief

CVE-2026-20352 records a Unknown severity vulnerability in Cisco Identity Services Engine RADIUS Denial of Service Vulnerability. The current sources do not mark it as known exploited. The current feed maps Cisco/Cisco Identity Services Engine Software (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 16, 2026Updated Sep 16, 2026Source checked Sep 16, 2026First seen by HOL Sep 16, 2026Material review Sep 16, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Cisco/Cisco Identity Services Engine Software (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Cisco/Cisco Identity Services Engine Softwaregeneric	3.2.0 \|\| 3.2.0 p1 \|\| 3.2.0 p2 \|\| 3.3.0 \|\| 3.2.0 p3 \|\| 3.2.0 p4 \|\| 3.2.0 p5 \|\| 3.2.0 p6 \|\| 3.3 Patch 2 \|\| 3.3 Patch 1 \|\| 3.3 Patch 3 \|\| 3.4.0 \|\| 3.2.0 p7 \|\| 3.3 Patch 4 \|\| 3.4 Patch 1 \|\| 3.3 Patch 5 \|\| 3.3 Patch 6 \|\| 3.4 Patch 2 \|\| 3.3 Patch 7 \|\| 3.4 Patch 3 \|\| 3.5.0 \|\| 3.4 Patch 4 \|\| 3.3 Patch 8 \|\| 3.2 Patch 8 \|\| 3.5 Patch 1 \|\| 3.3 Patch 9 \|\| 3.2 Patch 9 \|\| 3.4 Patch 5 \|\| 3.5 Patch 3 \|\| 3.5 Patch 2 \|\| 3.3 Patch 10 \|\| 3.3 Patch 11 \|\| 3.4 Patch 6 \|\| 3.2 Patch 10	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Cisco/Cisco Identity Services Engine Software.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 16, 2026

Sources and claim methodology

Source referencesec.cloudapps.cisco.com

Upstream source description

A vulnerability in the RADIUS feature of Cisco Identity Services Engine (ISE) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper handling of certain RADIUS requests. An attacker could exploit this vulnerability by sending a crafted RADIUS request directly to an affected device. A successful exploit could allow the attacker to cause the ISE node to become unavailable. For single node deployments in that condition, endpoints that have not already authenticated would be unable to access the network until the node comes back up on its own.

Quoted source text, attributed separately from HOL analysis.