CVE-2020-8299 Denial of service in Citrix ADC, Citrix Gateway, Citrix SD-WAN WANOP Edition

Medium 6.5 Published 16 Jun 2021 Updated 4 Aug 2024

An attacker on the same Layer 2 network segment can cause a denial of service in Citrix ADC and Gateway appliances through uncontrolled resource consumption.

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

What is CVE-2020-8299?

CVE-2020-8299 is a medium-severity denial of service vulnerability in Citrix ADC, Citrix Gateway, Citrix SD-WAN WANOP Edition, published on 16 Jun 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Citrix ADC and Citrix/NetScaler Gateway 13.0 before 13.0-76.29, 12.1-61.18, 11.1-65.20, Citrix ADC 12.1-FIPS before 12.1-55.238, and Citrix SD-WAN WANOP Edition before 11.4.0, 11.3.2, 11.3.1a, 11.2.3a, 11.1.2c, 10.2.9a suffers from uncontrolled resource consumption by way of a network-based denial-of-service from within the same Layer 2 network segment. Note that the attacker must be in the same Layer 2 network segment as the vulnerable appliance.

Weakness: CWE-400

Which versions are affected by CVE-2020-8299?

It affects 4 products.

Products include Citrix Application Delivery Controller Firmware, Citrix Gateway, Citrix Netscaler Gateway, Citrix Sd-Wan Wanop.

How do I fix CVE-2020-8299?

No fix has been published for CVE-2020-8299 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-2020-8299 being exploited?

There is no known exploitation of CVE-2020-8299 in the wild and no public exploit code.

Sources

Also known as GHSA-xvx2-hw78-h573.