CVE-2025-20191— Multiple Cisco Products Denial of Service Vulnerability
Quick assessment
Affected
Cisco Cisco NX-OS Software
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Cisco NX-OS Software等都是美国思科（Cisco）公司的产品。Cisco NX-OS Software是一套交换机使用的数据中心级操作系统软件。Cisco IOS是一套为其网络设备开发的操作系统。Cisco IOS XE是一个操作系统。 Cisco多款产品存在安全漏洞，该漏洞源于DHCPv6包处理不当，可能导致拒绝服务攻击。以下产品受到影响：Cisco IOS、Cisco IOS XE、Cisco NX-OS和Cisco Wireless LAN Controller AireOS。
Possible ATT&CK Techniques 2 AI
T1190 · Exploit Public-Facing Application T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-20191
Vulnerability Information
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Vulnerability Title
Multiple Cisco Products Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the Switch Integrated Security Features (SISF) of Cisco IOS Software, Cisco IOS XE Software, Cisco NX-OS Software, and Cisco Wireless LAN Controller (WLC) AireOS Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device.
This vulnerability is due to the incorrect handling of DHCPv6 packets. An attacker could exploit this vulnerability by sending a crafted DHCPv6 packet to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用不正确的长度值访问缓冲区
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco多款产品 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco NX-OS Software等都是美国思科（Cisco）公司的产品。Cisco NX-OS Software是一套交换机使用的数据中心级操作系统软件。Cisco IOS是一套为其网络设备开发的操作系统。Cisco IOS XE是一个操作系统。 Cisco多款产品存在安全漏洞，该漏洞源于DHCPv6包处理不当，可能导致拒绝服务攻击。以下产品受到影响：Cisco IOS、Cisco IOS XE、Cisco NX-OS和Cisco Wireless LAN Controller AireOS。
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 NX-OS Software | 8.2(5) | - |
|
| Cisco | Cisco Wireless LAN Controller (WLC) | 8.10.112.0 | - |
|
II. Public POCs for CVE-2025-20191
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2025-20191 (1)
Same Patch Batch · Cisco · 2025-05-07 · 35 CVEs total
| CVE-2025-20188 | 10.0 CRITICAL | Cisco IOS XE 信任管理问题漏洞 |
| CVE-2025-20186 | 8.8 HIGH | Cisco IOS XE 操作系统命令注入漏洞 |
| CVE-2025-20182 | 8.6 HIGH | Cisco Adaptive Security Appliance Software, Firepower Threat Defense Software and IOS XE S |
| CVE-2025-20154 | 8.6 HIGH | Cisco IOS, IOS XE and IOS XR Software TWAMP Denial of Service Vulnerability |
| CVE-2025-20162 | 8.6 HIGH | Cisco IOS XE 资源管理错误漏洞 |
| CVE-2025-20164 | 8.3 HIGH | Cisco IOS 安全漏洞 |
| CVE-2025-20122 | 7.8 HIGH | Cisco Catalyst SD-WAN Manager Privilege Escalation Vulnerability |
| CVE-2025-20192 | 7.7 HIGH | Cisco IOS XE 安全漏洞 |
| CVE-2025-20202 | 7.4 HIGH | Cisco IOS XE Wireless Controller Software 安全漏洞 |
| CVE-2025-20189 | 7.4 HIGH | Cisco IOS XE 安全漏洞 |
| CVE-2025-20140 | 7.4 HIGH | Cisco IOS XE 安全漏洞 |
| CVE-2025-20210 | 7.3 HIGH | Cisco Catalyst Center Unprotected API Endpoint |
| CVE-2025-20197 | 6.7 MEDIUM | Cisco IOS XE 输入验证错误漏洞 |
| CVE-2025-20200 | 6.7 MEDIUM | Cisco IOS XE 代码问题漏洞 |
| CVE-2025-20201 | 6.7 MEDIUM | Cisco IOS XE 代码问题漏洞 |
| CVE-2025-20190 | 6.5 MEDIUM | Cisco IOS XE Wireless Controller Software 访问控制错误漏洞 |
| CVE-2025-20193 | 6.5 MEDIUM | Cisco IOS XE 操作系统命令注入漏洞 |
| CVE-2025-20187 | 6.5 MEDIUM | Cisco SD-WAN Manager Software Arbitrary File Creation Vulnerability |
| CVE-2025-20155 | 6.0 MEDIUM | Cisco IOS XE 安全漏洞 |
| CVE-2025-20157 | 5.9 MEDIUM | Cisco Catalyst vManage Certificate Validation Vulnerability |
Showing top 20 of 35 CVEs. View all on vendor page → →
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V. Comments for CVE-2025-20191
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