CVE-2020-5933 Denial of service in BIG-IP

High 7.5 Published 29 Oct 2020 Updated 4 Aug 2024

Attackers can cause out-of-memory denial of service on BIG-IP systems using HTTP compression profiles via Slowloris-style attacks.

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-2020-5933?

CVE-2020-5933 is a high-severity denial of service vulnerability in F5 Big-Ip Access Policy Manager, published on 29 Oct 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

On versions 15.1.0-15.1.0.5, 14.1.0-14.1.2.3, 13.1.0-13.1.3.4, 12.1.0-12.1.5.1, and 11.6.1-11.6.5.1, when a BIG-IP system that has a virtual server configured with an HTTP compression profile processes compressed HTTP message payloads that require deflation, a Slowloris-style attack can trigger an out-of-memory condition on the BIG-IP system.

Which versions are affected by CVE-2020-5933?

It affects 11 products.

Products include F5 Big-Ip Access Policy Manager, F5 Big-Ip Advanced Firewall Manager, F5 Big-Ip Analytics, F5 Big-Ip Application Acceleration Manager, F5 Big-Ip Application Security Manager, F5 Big-Ip Domain Name System and 5 more.

How do I fix CVE-2020-5933?

No fix has been published for CVE-2020-5933 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-2020-5933 being exploited?

There is no known exploitation of CVE-2020-5933 in the wild and no public exploit code.

All F5 Big-Ip Access Policy Manager vulnerabilities

Sources

Also known as GHSA-vf5m-cfpq-j35j.