CVE-2020-3455 MEDIUM

CVE-2020-3455: Cisco FXOS Software for Firepower 4100/9300 Series Appliances Secure Boot Bypass Vulnerability

Vendor Cisco
Product Cisco Firepower Extensible Operating System (FXOS)
Weakness CWE-693
Published October 21, 2020
Last update November 13, 2024

CVSS base score

6.7/10
Attack vector Local
Attack complexity Low
Privileges required High
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

A vulnerability in the secure boot process of Cisco FXOS Software could allow an authenticated, local attacker to bypass the secure boot mechanisms. The vulnerability is due to insufficient protections of the secure boot process. An attacker could exploit this vulnerability by injecting code into a specific file that is then referenced during the device boot process. A successful exploit could allow the attacker to break the chain of trust and inject code into the boot process of the device which would be executed at each boot and maintain persistence across reboots.

Key dates

02Disclosure timeline

October 21, 2020 CVE published
November 13, 2024 Record updated