6.7 Medium

CVE-2020-3455 A vulnerability in the secure boot process of Cisco FXOS Software could allow an authenticated, local attacker to bypass…

Description

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.

Affected products and versions

Product	Affected versions	Fixed in
Cisco Firepower Extensible Operating System (FXOS)	Versions not published

References

20201021 Cisco FXOS Software for Firepower 4100/9300 Series Appliances Secure Boot Bypass Vulnerability tools.cisco.com

Timeline

Published October 21, 2020
Last modified November 13, 2024

The 15 CVEs of Cisco Firepower Extensible Operating System (FXOS) →

CVE-2026-20099 A vulnerability in the web-based management interface of Cisco FXOS Software and Cisco UCS Manager Software could… 6.7 Medium CVE-2026-20091 A vulnerability in the web-based management interface of Cisco FXOS Software and Cisco UCS Manager Software could… 4.8 Medium CVE-2024-20294 A vulnerability in the Link Layer Discovery Protocol (LLDP) feature of Cisco FXOS Software and Cisco NX-OS Software… 6.6 Medium CVE-2023-20234 A vulnerability in the CLI of Cisco FXOS Software could allow an authenticated, local attacker to create a file or… 4.4 Medium

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