CVE-2020-3308 Cisco Firepower Threat Defense Software Signature Verification Bypass Vulnerability
Authenticated administrators can bypass signature verification to install malicious patches on Cisco Firepower Threat Defense devices, enabling code execution.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-3308?
CVE-2020-3308 is a medium-severity vulnerability in Cisco Secure Firewall Management Center, published on 6 May 2020. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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.
Weakness: CWE-347
Which versions are affected by CVE-2020-3308?
It affects 2 products.
Products include Cisco Secure Firewall Management Center, Cisco Secure Firewall Threat Defense.
How do I fix CVE-2020-3308?
No fix has been published for CVE-2020-3308 yet. Limit exposure of the affected software until one is available.
Is CVE-2020-3308 being exploited?
There is no known exploitation of CVE-2020-3308 in the wild and no public exploit code.
Other vulnerabilities in Cisco Secure Firewall Management Center
- CVE-2026-20079 Cisco Firewall Management Center Authentication Bypass Using an Alternate Path or Channel
- CVE-2026-20131 Cisco Secure Firewall Management Center (FMC) Software and Cisco Security Cloud Control (SCC) Firewall Management Deserialization of Untrusted Data
- CVE-2026-20316 Cisco Secure Firewall Management Center Use of Hard-coded Password
- CVE-2025-20265 Cisco Secure Firewall Management Center Software Radius Remote Code Execution Vulnerability
- CVE-2024-20424 Command injection in Cisco Firepower Management Center
Sources
Also known as GHSA-88c7-xpjh-3f4j.