CVE-2020-3220 Cisco IOS XE Software IPsec VPN Denial of Service Vulnerability

Medium 6.8 Published 3 Jun 2020 Updated 15 Nov 2024

An unauthenticated remote attacker can disconnect legitimate IPsec VPN sessions on affected Cisco routers by tampering with ESP packets.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2020-3220?

CVE-2020-3220 is a medium-severity denial of service vulnerability in Cisco Ios Xe, published on 3 Jun 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the hardware crypto driver of Cisco IOS XE Software for Cisco 4300 Series Integrated Services Routers and Cisco Catalyst 9800-L Wireless Controllers could allow an unauthenticated, remote attacker to disconnect legitimate IPsec VPN sessions to an affected device. The vulnerability is due to insufficient verification of authenticity of received Encapsulating Security Payload (ESP) packets. An attacker could exploit this vulnerability by tampering with ESP cleartext values as a man-in-the-middle.

Weakness: CWE-345

Which versions are affected by CVE-2020-3220?

It affects 1 product.

Products include Cisco Ios Xe.

How do I fix CVE-2020-3220?

No fix has been published for CVE-2020-3220 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-2020-3220 being exploited?

There is no known exploitation of CVE-2020-3220 in the wild and no public exploit code.

All Cisco Ios Xe vulnerabilities

Sources

Also known as GHSA-rgv9-38w5-x798.