CVE-2019-6619

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-05-03 · updated 2026-06-17

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.

Affected products

F5 BIG-IP APM: from 12.1.0 before 12.1.4.1; from 13.0.0 before 13.1.1.5; from 14.0.0 before 14.1.0.2 — fixed in 12.1.4.1, 13.1.1.5, 14.1.0.2
BIG-IP: from 12.1.0 before 12.1.4.1; from 13.0.0 before 13.1.1.5; from 14.0.0 before 14.1.0.2 — fixed in 12.1.4.1, 13.1.1.5, 14.1.0.2
F5 Networks, Inc. BIG-IP (AAM): from 12.1.0 before 12.1.4.1; from 13.0.0 before 13.1.1.5; from 14.0.0 before 14.1.0.2 — fixed in 12.1.4.1, 13.1.1.5, 14.1.0.2
BIG-IP ASM: from 12.1.0 before 12.1.4.1; from 13.0.0 before 13.1.1.5; from 14.0.0 before 14.1.0.2 — fixed in 12.1.4.1, 13.1.1.5, 14.1.0.2
F5 Big-Ip Link Controller: from 12.1.0 before 12.1.4.1; from 13.0.0 before 13.1.1.5; from 14.0.0 before 14.1.0.2 — fixed in 12.1.4.1, 13.1.1.5, 14.1.0.2
F5 BIG-IP (LTM): from 12.1.0 before 12.1.4.1; from 13.0.0 before 13.1.1.5; from 14.0.0 before 14.1.0.2 — fixed in 12.1.4.1, 13.1.1.5, 14.1.0.2
F5 Networks, Inc. BIG-IP (PEM): from 12.1.0 before 12.1.4.1; from 13.0.0 before 13.1.1.5; from 14.0.0 before 14.1.0.2 — fixed in 12.1.4.1, 13.1.1.5, 14.1.0.2
F5 Big-Ip Webaccelerator: from 12.1.0 before 12.1.4.1; from 13.0.0 before 13.1.1.5; from 14.0.0 before 14.1.0.2 — fixed in 12.1.4.1, 13.1.1.5, 14.1.0.2

How to fix

Upgrade to a fixed version: F5 BIG-IP APM 12.1.4.1, 13.1.1.5, 14.1.0.2; BIG-IP 12.1.4.1, 13.1.1.5, 14.1.0.2; F5 Networks, Inc. BIG-IP (AAM) 12.1.4.1, 13.1.1.5, 14.1.0.2; BIG-IP ASM 12.1.4.1, 13.1.1.5, 14.1.0.2; F5 Big-Ip Link Controller 12.1.4.1, 13.1.1.5, 14.1.0.2; F5 BIG-IP (LTM) 12.1.4.1, 13.1.1.5, 14.1.0.2; F5 Networks, Inc. BIG-IP (PEM) 12.1.4.1, 13.1.1.5, 14.1.0.2; F5 Big-Ip Webaccelerator 12.1.4.1, 13.1.1.5, 14.1.0.2. Check the vendor advisory for mitigations.

References

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