CVE-2019-6594 Denial of service in BIG-IP (LTM, AAM, AFM, Analytics, APM, ASM, DNS, Edge Gateway, FPS, GTM, Link Controller, PEM, WebAccelerator)

Medium 5.9 Published 26 Feb 2019 Updated 17 Sep 2024

An attacker can cause a denial of service on F5 BIG-IP devices by sending multiple zero-length DATA_FIN packets, triggering an infinite loop in MPTCP processing.

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-2019-6594?

CVE-2019-6594 is a medium-severity denial of service vulnerability in F5 Big-Ip Access Policy Manager, published on 26 Feb 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

On BIG-IP 11.5.1-11.6.3.2, 12.1.3.4-12.1.3.7, 13.0.0 HF1-13.1.1.1, and 14.0.0-14.0.0.2, Multi-Path TCP (MPTCP) does not protect against multiple zero length DATA_FINs in the reassembly queue, which can lead to an infinite loop in some circumstances.

Weakness: CWE-835

Which versions are affected by CVE-2019-6594?

It affects 12 products.

Products include F5 Big-Ip Access Policy Manager, F5 Big-Ip Advanced Firewall Manager, F5 Big-Ip Analytics, F5 Big-Ip Application Security Manager, F5 Big-Ip Domain Name System, F5 Big-Ip Edge Gateway and 6 more.

How do I fix CVE-2019-6594?

No fix has been published for CVE-2019-6594 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-2019-6594 being exploited?

There is no known exploitation of CVE-2019-6594 in the wild and no public exploit code.

All F5 Big-Ip Access Policy Manager vulnerabilities

Sources

Also known as GHSA-fh8c-2997-r5xh.