CVE-2019-6611

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

When BIG-IP 14.0.0-14.1.0.1, 13.0.0-13.1.1.4, 12.1.0-12.1.4, 11.6.1-11.6.3.4, and 11.5.2-11.5.8 are processing certain rare data sequences occurring in PPTP VPN traffic, the BIG-IP system may execute incorrect logic. The TMM may restart and produce a core file as a result of this condition. The BIG-IP system provisioned with the CGNAT module and configured with a virtual server using a PPTP profile is exposed to this vulnerability.

Affected products

F5 BIG-IP APM: from 11.5.2 before 11.5.9; from 11.6.1 before 11.6.4; 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 11.5.9, 11.6.4, 12.1.4.1, 13.1.1.5, 14.1.0.2
BIG-IP: from 11.5.2 before 11.5.9; from 11.6.1 before 11.6.4; 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 11.5.9, 11.6.4, 12.1.4.1, 13.1.1.5, 14.1.0.2
F5 Big-Ip Analytics: from 11.5.2 before 11.5.9; from 11.6.1 before 11.6.4; 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 11.5.9, 11.6.4, 12.1.4.1, 13.1.1.5, 14.1.0.2
F5 Networks, Inc. BIG-IP (AAM): from 11.5.2 before 11.5.9; from 11.6.1 before 11.6.4; 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 11.5.9, 11.6.4, 12.1.4.1, 13.1.1.5, 14.1.0.2
BIG-IP ASM: from 11.5.2 before 11.5.9; from 11.6.1 before 11.6.4; 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 11.5.9, 11.6.4, 12.1.4.1, 13.1.1.5, 14.1.0.2
F5 BIG-IP DNS: from 11.5.2 before 11.5.9; from 11.6.1 before 11.6.4; 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 11.5.9, 11.6.4, 12.1.4.1, 13.1.1.5, 14.1.0.2
F5 Big-Ip Edge Gateway: from 11.5.2 before 11.5.9; from 11.6.1 before 11.6.4; 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 11.5.9, 11.6.4, 12.1.4.1, 13.1.1.5, 14.1.0.2
F5 Big-Ip Fraud Protection Service: from 11.5.2 before 11.5.9; from 11.6.1 before 11.6.4; 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 11.5.9, 11.6.4, 12.1.4.1, 13.1.1.5, 14.1.0.2
F5 Big-Ip Global Traffic Manager: from 11.5.2 before 11.5.9; from 11.6.1 before 11.6.4; 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 11.5.9, 11.6.4, 12.1.4.1, 13.1.1.5, 14.1.0.2
F5 Big-Ip Link Controller: from 11.5.2 before 11.5.9; from 11.6.1 before 11.6.4; 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 11.5.9, 11.6.4, 12.1.4.1, 13.1.1.5, 14.1.0.2
F5 BIG-IP (LTM): from 11.5.2 before 11.5.9; from 11.6.1 before 11.6.4; 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 11.5.9, 11.6.4, 12.1.4.1, 13.1.1.5, 14.1.0.2
F5 Networks, Inc. BIG-IP (PEM): from 11.5.2 before 11.5.9; from 11.6.1 before 11.6.4; 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 11.5.9, 11.6.4, 12.1.4.1, 13.1.1.5, 14.1.0.2
F5 Big-Ip Webaccelerator: from 11.5.2 before 11.5.9; from 11.6.1 before 11.6.4; 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 11.5.9, 11.6.4, 12.1.4.1, 13.1.1.5, 14.1.0.2

How to fix

Upgrade to a fixed version: F5 BIG-IP APM 11.5.9, 11.6.4, 12.1.4.1, 13.1.1.5; BIG-IP 11.5.9, 11.6.4, 12.1.4.1, 13.1.1.5; F5 Big-Ip Analytics 11.5.9, 11.6.4, 12.1.4.1, 13.1.1.5; F5 Networks, Inc. BIG-IP (AAM) 11.5.9, 11.6.4, 12.1.4.1, 13.1.1.5; BIG-IP ASM 11.5.9, 11.6.4, 12.1.4.1, 13.1.1.5; F5 BIG-IP DNS 11.5.9, 11.6.4, 12.1.4.1, 13.1.1.5; F5 Big-Ip Edge Gateway 11.5.9, 11.6.4, 12.1.4.1, 13.1.1.5; F5 Big-Ip Fraud Protection Service 11.5.9, 11.6.4, 12.1.4.1, 13.1.1.5; F5 Big-Ip Global Traffic Manager 11.5.9, 11.6.4, 12.1.4.1, 13.1.1.5; F5 Big-Ip Link Controller 11.5.9, 11.6.4, 12.1.4.1, 13.1.1.5; F5 BIG-IP (LTM) 11.5.9, 11.6.4, 12.1.4.1, 13.1.1.5; F5 Networks, Inc. BIG-IP (PEM) 11.5.9, 11.6.4, 12.1.4.1, 13.1.1.5. Check the vendor advisory for mitigations.

References

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