CVE-2019-6619 Denial of service in BIG-IP (LTM, AAM, AFM, APM, ASM, Link Controller, PEM, WebAccelerator)

High 7.5 Published 3 May 2019 Updated 4 Aug 2024

Attackers can cause a denial of service by sending crafted HTTP/2 traffic with zero-length ALPN extensions to BIG-IP systems with specific profiles enabled.

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-2019-6619?

CVE-2019-6619 is a high-severity denial of service vulnerability in F5 Big-Ip Access Policy Manager, published on 3 May 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

On BIG-IP 14.0.0-14.1.0.1, 13.0.0-13.1.1.4, and 12.1.0-12.1.4, the Traffic Management Microkernel (TMM) may restart when a virtual server has an HTTP/2 profile with Application Layer Protocol Negotiation (ALPN) enabled and it processes traffic where the ALPN extension size is zero.

Which versions are affected by CVE-2019-6619?

It affects 8 products.

Products include F5 Big-Ip Access Policy Manager, F5 Big-Ip Advanced Firewall Manager, F5 Big-Ip Application Acceleration Manager, F5 Big-Ip Application Security Manager, F5 Big-Ip Link Controller, F5 Big-Ip Local Traffic Manager and 2 more.

How do I fix CVE-2019-6619?

No fix has been published for CVE-2019-6619 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-2019-6619 being exploited?

There is no known exploitation of CVE-2019-6619 in the wild and no public exploit code.

All F5 Big-Ip Access Policy Manager vulnerabilities

Sources

Also known as GHSA-h9f9-5vmf-w2j3.