CVE-2020-3204 Cisco IOS and IOS XE Software Tcl Arbitrary Code Execution Vulnerability

Medium 6.7 Published 3 Jun 2020 Updated 15 Nov 2024

Authenticated local attackers with privileged EXEC access can execute arbitrary code with root privileges via malicious Tcl scripts in Cisco IOS.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2020-3204?

CVE-2020-3204 is a medium-severity code injection vulnerability in Cisco Ios, 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 the Tool Command Language (Tcl) interpreter of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, local attacker with privileged EXEC credentials to execute arbitrary code on the underlying operating system (OS) with root privileges. The vulnerability is due to insufficient input validation of data passed to the Tcl interpreter. An attacker could exploit this vulnerability by loading malicious Tcl code on an affected device. A successful exploit could allow the attacker to cause memory corruption or execute the code with root privileges on the underlying OS of the affected device.

Weakness: CWE-20

Which versions are affected by CVE-2020-3204?

It affects 2 products.

Products include Cisco Ios, Cisco Ios Xe.

How do I fix CVE-2020-3204?

No fix has been published for CVE-2020-3204 yet. Limit exposure of the affected software until one is available.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2020-3204 being exploited?

There is no known exploitation of CVE-2020-3204 in the wild and no public exploit code.

All Cisco Ios vulnerabilities

Sources

Also known as GHSA-4273-vg8f-3qj2.