Buffer Access with Incorrect Length Value in Cisco Systems, Inc products - CVE-2025-20191
Published: May 9, 2025
Vulnerability identifier: #VU108841
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2025-20191
CWE-ID: CWE-805
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vendor: Cisco Systems, Inc
Affected software:
Cisco IOS
Cisco IOS XE
Cisco NX-OS
Cisco Wireless LAN Controller (WLC) AireOS Software
Cisco IOS
Cisco IOS XE
Cisco NX-OS
Cisco Wireless LAN Controller (WLC) AireOS Software
Detailed vulnerability description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to the incorrect handling of DHCPv6 packets in the Switch Integrated Security Features (SISF). A remote attacker on the local network can send a specially crafted DHCPv6 packet and cause a denial of service condition on the target system.
How to mitigate CVE-2025-20191
Install updates from vendor's website.