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Vulnerabilities

Vulnerability · CVE-2025-20152

A vulnerability in the RADIUS message processing feature of Cisco Identity Services Engine (ISE) could allow an unauthenticated, remote attacker to cause a denial of service (DoS)

Published May 21, 2025 · catalog updated May 21, 2025 · Cisco Cisco Identity Services Engine Software

Check this week

CVE-2025-20152 is not in CISA KEV. FIRST estimates a 70.00% chance of exploitation in the next 30 days. Check whether you run Cisco Cisco Identity Services Engine Software.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.6
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
70.00%
Remediation
Advisory link
Affected products
vendor Cisco Cisco Identity Services Engine Software 3.4.0

A vulnerability in the RADIUS message processing 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 specific authentication request to a network access device (NAD) that uses Cisco ISE for authentication, authorization, and accounting (AAA). A successful exploit could allow the attacker to cause Cisco ISE to reload.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Cisco Cisco Identity Services Engine Software 3.4.03.4.0

How to fix CVE-2025-20152

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-20152 is not in CISA KEV. FIRST estimates a 70.00% chance of exploitation in the next 30 days. Check whether you run Cisco Cisco Identity Services Engine Software.

Which versions are affected?

Compare what you have installed with Cisco Cisco Identity Services Engine Software 3.4.0 3.4.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 70.00%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Cisco security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. May 21, 2025 · EUVD

    Detected

    A vulnerability in the RADIUS message processing 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 specific authentication request to a network access de

  2. May 21, 2025 · EUVD

    Updated

    A vulnerability in the RADIUS message processing 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 specific authentication request to a network access de

Sources

  • CVE.orgVulnerability recordCVE-2025-20152

    Official CVE identifier

    cve.org
  • EUVDVulnerability recordEUVD-2025-16022

    A vulnerability in the RADIUS message processing 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 re

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog May 21, 2025. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.