CVE-2021-22919 Denial of service in Citrix ADC, Citrix Gateway, Citrix SD-WAN WANOP

High 7.5 Published 5 Aug 2021 Updated 3 Aug 2024

Attackers can exhaust disk space on Citrix ADC, Gateway, and SD-WAN appliances, causing a denial of service.

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-2021-22919?

CVE-2021-22919 is a high-severity denial of service vulnerability in Citrix ADC, Citrix Gateway, Citrix SD-WAN WANOP, published on 5 Aug 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability has been discovered in Citrix ADC (formerly known as NetScaler ADC) and Citrix Gateway (formerly known as NetScaler Gateway), and Citrix SD-WAN WANOP Edition models 4000-WO, 4100-WO, 5000-WO, and 5100-WO. These vulnerabilities, if exploited, could lead to the limited available disk space on the appliances being fully consumed.

Weakness: CWE-770

Which versions are affected by CVE-2021-22919?

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-2021-22919?

No fix has been published for CVE-2021-22919 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-2021-22919 being exploited?

There is no known exploitation of CVE-2021-22919 in the wild and no public exploit code.

Sources

Also known as GHSA-8v5q-r6pr-xg3j.