CVE-2026-20104 | Cisco IOS XE up to 17.18.2 Bootloader buffer underflow (cisco-sa-xe-secureboot-bypass-B6uYxYSZ / EUVD-2026-15435)
A vulnerability was found in Cisco IOS XE. It has been rated as problematic. This affects an unknown function of the component Bootloader. This manipulation causes buffer underwrite.
This vulnerability is registered as CVE-2026-20104. It is feasible to perform the attack on the physical device. No exploit is available.
Upgrading the affected component is advised.