CVE-2026-20352: Improper Restriction of Operations within the Bounds of a Memory Buffer in Cisco Cisco Identity Services Engine Software
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.
AI Analysis
Technical Summary
This vulnerability arises from improper restriction of operations within the bounds of a memory buffer in the RADIUS feature of Cisco Identity Services Engine software. An attacker can exploit this by sending specially crafted RADIUS requests directly to the device, causing the ISE node to become unavailable. The vulnerability affects specific versions of Cisco ISE software and results in a denial of service condition without requiring authentication.
Potential Impact
Successful exploitation results in a denial of service condition on the affected Cisco ISE node, making it unavailable. In single node deployments, this prevents unauthenticated endpoints from accessing the network until the node recovers automatically. There is no impact on confidentiality or integrity reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or workaround information is provided in the available data.
CVE-2026-20352: Improper Restriction of Operations within the Bounds of a Memory Buffer in Cisco Cisco Identity Services Engine Software
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.
CVSS v3.1
Score 8.6high
Affected software
Cisco
Cisco Identity Services Engine Software
pkg:github/cisco/identity-services-engineRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability arises from improper restriction of operations within the bounds of a memory buffer in the RADIUS feature of Cisco Identity Services Engine software. An attacker can exploit this by sending specially crafted RADIUS requests directly to the device, causing the ISE node to become unavailable. The vulnerability affects specific versions of Cisco ISE software and results in a denial of service condition without requiring authentication.
Potential Impact
Successful exploitation results in a denial of service condition on the affected Cisco ISE node, making it unavailable. In single node deployments, this prevents unauthenticated endpoints from accessing the network until the node recovers automatically. There is no impact on confidentiality or integrity reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or workaround information is provided in the available data.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- cisco
- Date Reserved
- 2025-10-08T11:59:15.414Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aab006d55bf5e2cf5232026
Added to database: 09/16/2026, 20:47:41 UTC
Last enriched: 09/16/2026, 21:02:59 UTC
Last updated: 09/17/2026, 04:01:24 UTC
Views: 5
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.