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Fencer Vulns
high 7.5

CVE-2019-6684 json

On versions 15.0.0-15.0.1.1, 14.0.0-14.1.2.2, 13.1.0-13.1.3.1, 12.1.0-12.1.5, and 11.5.2-11.6.5.1, under certain conditions, a multi-bladed…

published 2019-12-23 6 y ago modified 2026-06-17 4 mo ago also EUVD-2019-16243

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 64%
public exploits
0
none known

Summary

On versions 15.0.0-15.0.1.1, 14.0.0-14.1.2.2, 13.1.0-13.1.3.1, 12.1.0-12.1.5, and 11.5.2-11.6.5.1, under certain conditions, a multi-bladed BIG-IP Virtual Clustered Multiprocessing (vCMP) may drop broadcast packets when they are rebroadcast to the vCMP guest secondary blades. An attacker can leverage the fragmented broadcast IP packets to perform any type of fragmentation-based attack.

Patch / fix

  • f5 big-ip_access_policy_manager 13.1.3.2, 14.1.2.3, 15.1.0
  • f5 big-ip_advanced_firewall_manager 13.1.3.2, 14.1.2.3, 15.1.0
  • f5 big-ip_analytics 13.1.3.2, 14.1.2.3, 15.1.0
  • f5 big-ip_application_acceleration_manager 13.1.3.2, 14.1.2.3, 15.1.0
  • f5 big-ip_application_security_manager 13.1.3.2, 14.1.2.3, 15.1.0
  • f5 big-ip_domain_name_system 13.1.3.2, 14.1.2.3, 15.1.0
  • f5 big-ip_fraud_protection_service 13.1.3.2, 14.1.2.3, 15.1.0
  • f5 big-ip_global_traffic_manager 13.1.3.2, 14.1.2.3, 15.1.0
  • f5 big-ip_link_controller 13.1.3.2, 14.1.2.3, 15.1.0
  • f5 big-ip_local_traffic_manager 13.1.3.2, 14.1.2.3, 15.1.0
  • f5 big-ip_policy_enforcement_manager 13.1.3.2, 14.1.2.3, 15.1.0

Exploit prediction

1.04% chance of exploitation in the next 30 days, higher than 64% 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

References

Sources

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.