CVE-2020-3458

What it is

Multiple vulnerabilities in the secure boot process of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software for the Firepower 1000 Series and Firepower 2100 Series Appliances could allow an authenticated, local attacker to bypass the secure boot mechanism. The vulnerabilities are due to insufficient protections of the secure boot process. An attacker could exploit these vulnerabilities by injecting code into specific files that are 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.

At a glance

Exploitability

Can be exploited locally on the machine with an admin-level account. High risk of data exposure, data tampering, service disruption.

Exploit odds

0.3% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2020-10-21 19:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-08-11 19:37 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.3% in the next 30 days (EPSS).
• Severity: 6.7 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2020-10-21 19:15 UTC

Last modified

2026-08-11 19:37 UTC

Exploit probability

0.3% · EPSS, next 30 days

Weakness

CWE-693

Record status

Modified

Affected

• Cisco Adaptive Security Appliance Software < 9.8.4.26
• Cisco Adaptive Security Appliance Software < 9.9.2.80
• Cisco Adaptive Security Appliance Software < 9.10.1.43
• Cisco Adaptive Security Appliance Software < 9.12.4.3
• Cisco Adaptive Security Appliance Software < 9.13.1.13
• Cisco Adaptive Security Appliance Software < 9.14.1.15
• Cisco Secure Firewall Threat Defense ≤ 6.2.2
• Cisco Secure Firewall Threat Defense < 6.3.0.6

Attack profile CVSS 3.1 · 6.7

Attack vector

Local

Complexity

Low

Privileges needed

High

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2020-3458.md and follow it. Check whether this project is affected by CVE-2020-3458. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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