---
title: "CVE-2026-20352: Cisco Identity Services Engine - Denial of Service"
description: "Cisco Identity Services Engine contains a denial of service vulnerability caused by improper handling of crafted RADIUS requests, letting unauthenticated remote attackers cause node unavailability, exploit requires sending crafted RADIUS requests."
url: https://panop.io/threat-heartbeat/CVE-2026-20352/
---

# CVE-2026-20352 Cisco Identity Services Engine - Denial of Service

Cisco Identity Services Engine contains a denial of service vulnerability caused by improper handling of crafted RADIUS requests, letting unauthenticated remote attackers cause node unavailability, exploit requires sending crafted RADIUS requests.

CVSS base score 8.6 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.40% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-20352)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Published

16 September 2026

Updated

15 October 2026

Weakness

[CWE-119](https://cwe.mitre.org/data/definitions/119.html)

## Vendor fix

Update to the latest available version that addresses this vulnerability.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-20352](https://nvd.nist.gov/vuln/detail/CVE-2026-20352)
- [https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-RADIUS-dos-wR3hYPMw](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-RADIUS-dos-wR3hYPMw)

[← All CVEs](https://panop.io/threat-heartbeat/)

## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

[Book a demo](https://panop.io/demo)