What’s Vulnerable › Vulnerabilities

CVE-2020-3308: Cisco Firepower Threat Defense Software Signature Verification Bypass Vulnerability

• Severity: medium (CVSS 4.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-05-06 · updated 2026-08-11
• Weakness: CWE-347

Description

A vulnerability in the Image Signature Verification feature of Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, remote attacker with administrator-level credentials to install a malicious software patch on an affected device. The vulnerability is due to improper verification of digital signatures for patch images. An attacker could exploit this vulnerability by crafting an unsigned software patch to bypass signature checks and loading it on an affected device. A successful exploit could allow the attacker to boot a malicious software patch image.

Affected products

• Cisco Firepower Management Center: 6.2.2, 6.2.3
• Cisco Firepower Threat Defense Software: before 6.2.2.1 — fixed in 6.2.2.1

How to fix

Upgrade to a fixed version: Cisco Firepower Threat Defense Software 6.2.2.1. Check the vendor advisory for mitigations.

References

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sigbypass-FcvPPCeP
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sigbypass-FcvPPCeP

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