CVE-2020-3201 Cisco IOS and IOS XE Software Tcl Denial of Service Vulnerability

Medium 6.0 Published 3 Jun 2020 Updated 15 Nov 2024

An authenticated local attacker with privileged EXEC access can cause a denial of service by executing crafted Tcl arguments on Cisco IOS devices.

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-2020-3201?

CVE-2020-3201 is a medium-severity denial of service 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 cause a denial of service (DoS) condition on an affected system. The vulnerability is due to insufficient input validation of data passed to the Tcl interpreter. An attacker could exploit this vulnerability by executing crafted Tcl arguments on an affected device. An exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.

Weakness: CWE-20

Which versions are affected by CVE-2020-3201?

It affects 2 products.

Products include Cisco Ios, Cisco Ios Xe.

How do I fix CVE-2020-3201?

No fix has been published for CVE-2020-3201 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2020-3201 being exploited?

There is no known exploitation of CVE-2020-3201 in the wild and no public exploit code.

All Cisco Ios vulnerabilities

Sources

Also known as GHSA-c4v9-f6pv-f763.