CVE-2020-3209 Cisco IOS XE Software Digital Signature Verification Bypass Vulnerability

What is CVE-2020-3209?

CVE-2020-3209 is a medium-severity vulnerability in Cisco Ios Xe, published on 3 Jun 2020. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A vulnerability in software image verification in Cisco IOS XE Software could allow an unauthenticated, physical attacker to install and boot a malicious software image or execute unsigned binaries on an affected device. The vulnerability is due to an improper check on the area of code that manages the verification of the digital signatures of system image files during the initial boot process. An attacker could exploit this vulnerability by loading unsigned software on an affected device. A successful exploit could allow the attacker to install and boot a malicious software image or execute unsigned binaries on the targeted device.

Weakness: CWE-347

Which versions are affected by CVE-2020-3209?

It affects 1 product.

Products include Cisco Ios Xe.

How do I fix CVE-2020-3209?

No fix has been published for CVE-2020-3209 yet. Limit exposure of the affected software until one is available.

Is CVE-2020-3209 being exploited?

There is no known exploitation of CVE-2020-3209 in the wild and no public exploit code.

Other vulnerabilities in Cisco Ios Xe

• CVE-2023-20198 Cisco IOS XE Web UI Privilege Escalation Exploited Critical 10.0
• CVE-2018-0151 Cisco IOS Software and Cisco IOS XE Software Quality of Service Remote Code Execution Exploited Critical 9.8
• CVE-2023-20273 Cisco IOS XE Web UI Command Injection Exploited High 7.2
• CVE-2025-20188 Hardcoded credentials in Cisco IOS XE Software Critical 10.0
• CVE-2021-34770 Cisco IOS XE Software for Catalyst 9000 Family Wireless Controllers CAPWAP Remote Code Execution Vulnerability Critical 10.0

All Cisco Ios Xe vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-5m9q-364f-fv6c.