CVE-2025-20343— Cisco Identity Services Engine Radius Suppression Denial of Service Vulnerability
Quick assessment
Affected
Cisco Cisco Identity Services Engine Software
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Cisco Identity Services Engine（Cisco ISE）是美国思科（Cisco）公司的一款环境感知平台（ISE身份服务引擎）。该平台通过收集网络、用户和设备中的实时信息，制定并实施相应策略来监管网络。 Cisco Identity Services Engine（Cisco ISE）存在安全漏洞，该漏洞源于处理RADIUS访问请求时存在逻辑错误，可能导致拒绝服务。
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-20343
Vulnerability Information
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Vulnerability Title
Cisco Identity Services Engine Radius Suppression Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the RADIUS setting Reject RADIUS requests from clients with repeated failures on Cisco Identity Services Engine (ISE) could allow an unauthenticated, remote attacker to cause Cisco ISE to restart unexpectedly.
This vulnerability is due to a logic error when processing a RADIUS access request for a MAC address that is already a rejected endpoint. An attacker could exploit this vulnerability by sending a specific sequence of multiple crafted RADIUS access request messages to Cisco ISE. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when Cisco ISE restarts.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不充分的比较
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco Identity Services Engine 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco Identity Services Engine（Cisco ISE）是美国思科（Cisco）公司的一款环境感知平台（ISE身份服务引擎）。该平台通过收集网络、用户和设备中的实时信息，制定并实施相应策略来监管网络。 Cisco Identity Services Engine（Cisco ISE）存在安全漏洞，该漏洞源于处理RADIUS访问请求时存在逻辑错误，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Cisco | Cisco Identity Services Engine Software | 3.4.0 | - |
|
II. Public POCs for CVE-2025-20343
| # | POC Description | Source Link | Shenlong Link |
|---|---|---|---|
| 1 | CVE-2025-20343 | https://github.com/B1ack4sh/Blackash-CVE-2025-20343 | POC Details |
| 2 | CVE-2025-20343 | https://github.com/Ashwesker/Blackash-CVE-2025-20343 | POC Details |
| 3 | CVE-2025-20343 | https://github.com/fevar54/Blackash-CVE-2025-20343 | POC Details |
AI-Generated POC
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Same Patch Batch · Cisco · 2025-11-05 · 11 CVEs total
| CVE-2025-20354 | 9.8 CRITICAL | Cisco Unified Contact Center Express Remote Code Execution Vulnerability |
| CVE-2025-20358 | 9.4 CRITICAL | Cisco Unified Contact Center Express Editor Authentication Bypass Vulnerability |
| CVE-2025-20375 | 6.5 MEDIUM | Cisco Unified Contact Center Express Arbitrary File Upload Vulnerability |
| CVE-2025-20376 | 6.5 MEDIUM | Cisco Unified Contact Center Express Remote Code Execution Vulnerability |
| CVE-2025-20304 | 5.4 MEDIUM | Cisco Identity Services Engine 跨站脚本漏洞 |
| CVE-2025-20303 | 5.4 MEDIUM | Cisco Identity Services Engine 跨站脚本漏洞 |
| CVE-2025-20374 | 4.9 MEDIUM | Cisco Unified Contact Center Express Arbitrary File Download Vulnerability |
| CVE-2025-20289 | 4.8 MEDIUM | Cisco Identity Services Engine 跨站脚本漏洞 |
| CVE-2025-20305 | 4.3 MEDIUM | Cisco Identity Services Engine 安全漏洞 |
| CVE-2025-20377 | 4.3 MEDIUM | Cisco Unified Intelligence Center API Information Disclosure Vulnerability |
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V. Comments for CVE-2025-20343
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