CVE-2025-20191
Multiple Cisco Products Denial of Service 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.
Weakness: CWE-805
Affected products
| Vendor | Product | Category | Matched by |
|---|---|---|---|
| Cisco | Cisco NX-OS Software | Routing & Switching | cna-assigner |
| Cisco | Cisco Wireless LAN Controller | Routing & Switching | cna-assigner |
Vendor-reported products (2)
- Cisco · Cisco NX-OS Software
- Cisco · Cisco Wireless LAN Controller (WLC)
Vendor advisory
Multiple Cisco Products Switch Integrated Security Features DHCPv6 Denial of Service Vulnerability
Cisco’s rating: High (advisory CVSS 7.4) · Published May 7, 2025
Bug IDs: CSCvo13585 , CSCvq14413 , CSCwj88828 , CSCwk02672 , CSCwk02785 , CSCwk04230
The vendor’s rating applies to the whole advisory and can differ from this CVE’s own CVSS severity. Where this comes from