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 h…

published 2019-05-03 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-16178

cvss: 7.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.8%; EPSS 1.8% chance of exploitation in 30 days, percentile 78%
public exploits: 0; none known

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.

Patch / fix

fixed in 8

f5 big-ip_access_policy_manager 12.1.4.1, 13.1.1.5, 14.1.0.2
f5 big-ip_advanced_firewall_manager 12.1.4.1, 13.1.1.5, 14.1.0.2
f5 big-ip_application_acceleration_manager 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_policy_enforcement_manager 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
f5 big-ip_application_security_manager 12.1.4.1, 13.1.1.5, 14.1.0.2
f5 big-ip_local_traffic_manager 12.1.4.1, 13.1.1.5, 14.1.0.2

Exploit prediction

1.77% chance of exploitation in the next 30 days, higher than 78% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

F5 BIG-IP (LTM, AAM, AFM, APM, ASM, Link Controller, PEM, WebAccelerator)

References

support.f5.com /csp/article/K94563344
vendor-advisory
securityfocus.com /bid/108190
vdb-entry, broken-link, third-party-advisory

Sources

CVE List CVE-2019-6619
NVD CVE-2019-6619

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary