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7.5

F5 BIG‑IP modules may lose broadcast packets, enabling attacks

CVE-2019-6684 · published 6 years ago
Summary

Several F5 BIG‑IP features—including Access Policy Manager, Advanced Firewall Manager, Analytics, Application Acceleration Manager, and Application Security Manager—can drop broadcast traffic when it is rebroadcast to secondary virtual blades. This loss can be abused with specially crafted fragmented packets to launch attacks against the system. Apply the latest software updates from F5 or follow their guidance to mitigate the issue.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
f5 big-ip_access_policy_manager >= 11.5.2, <= 11.6.5
>= 12.1.0, <= 12.1.5
>= 13.0.0, < 13.1.3.2
>= 14.0.0, < 14.1.2.3
>= 15.0.0, < 15.1.0
cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:*
f5 big-ip_advanced_firewall_manager >= 11.5.2, <= 11.6.5
>= 12.1.0, <= 12.1.5
>= 13.0.0, < 13.1.3.2
>= 14.0.0, < 14.1.2.3
>= 15.0.0, < 15.1.0
cpe:2.3:a:f5:big-ip_advanced_firewall_manager:*:*:*:*:*:*:*:*
f5 big-ip_analytics >= 11.5.2, <= 11.6.5
>= 12.1.0, <= 12.1.5
>= 13.0.0, < 13.1.3.2
>= 14.0.0, < 14.1.2.3
>= 15.0.0, < 15.1.0
cpe:2.3:a:f5:big-ip_analytics:*:*:*:*:*:*:*:*
f5 big-ip_application_acceleration_manager >= 11.5.2, <= 11.6.5
>= 12.1.0, <= 12.1.5
>= 13.0.0, < 13.1.3.2
>= 14.0.0, < 14.1.2.3
>= 15.0.0, < 15.1.0
cpe:2.3:a:f5:big-ip_application_acceleration_manager:*:*:*:*:*:*:*:*
f5 big-ip_application_security_manager >= 11.5.2, <= 11.6.5
>= 12.1.0, <= 12.1.5
>= 13.0.0, < 13.1.3.2
>= 14.0.0, < 14.1.2.3
>= 15.0.0, < 15.1.0
cpe:2.3:a:f5:big-ip_application_security_manager:*:*:*:*:*:*:*:*
f5 big-ip_domain_name_system >= 11.5.2, <= 11.6.5
>= 12.1.0, <= 12.1.5
>= 13.0.0, < 13.1.3.2
>= 14.0.0, < 14.1.2.3
>= 15.0.0, < 15.1.0
cpe:2.3:a:f5:big-ip_domain_name_system:*:*:*:*:*:*:*:*
f5 big-ip_fraud_protection_service >= 11.5.2, <= 11.6.5
>= 12.1.0, <= 12.1.5
>= 13.0.0, < 13.1.3.2
>= 14.0.0, < 14.1.2.3
>= 15.0.0, < 15.1.0
cpe:2.3:a:f5:big-ip_fraud_protection_service:*:*:*:*:*:*:*:*
f5 big-ip_global_traffic_manager >= 11.5.2, <= 11.6.5
>= 12.1.0, <= 12.1.5
>= 13.0.0, < 13.1.3.2
>= 14.0.0, < 14.1.2.3
>= 15.0.0, < 15.1.0
cpe:2.3:a:f5:big-ip_global_traffic_manager:*:*:*:*:*:*:*:*
f5 big-ip_link_controller >= 11.5.2, <= 11.6.5
>= 12.1.0, <= 12.1.5
>= 13.0.0, < 13.1.3.2
>= 14.0.0, < 14.1.2.3
>= 15.0.0, < 15.1.0
cpe:2.3:a:f5:big-ip_link_controller:*:*:*:*:*:*:*:*
f5 big-ip_local_traffic_manager >= 11.5.2, <= 11.6.5
>= 12.1.0, <= 12.1.5
>= 13.0.0, < 13.1.3.2
>= 14.0.0, < 14.1.2.3
>= 15.0.0, < 15.1.0
cpe:2.3:a:f5:big-ip_local_traffic_manager:*:*:*:*:*:*:*:*
f5 big-ip_policy_enforcement_manager >= 11.5.2, <= 11.6.5
>= 12.1.0, <= 12.1.5
>= 13.0.0, < 13.1.3.2
>= 14.0.0, < 14.1.2.3
>= 15.0.0, < 15.1.0
cpe:2.3:a:f5:big-ip_policy_enforcement_manager:*:*:*:*:*:*:*:*
Original advisory text
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 ...
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.
References
Fix within
Internet-facing 14 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically (estimated)
  • Gives an attacker partial control (estimated)
Severity
7.5 High
Exploitation
1% chance of attack within 30 days
Timeline
Published23 Dec 2019
Updated31 Oct 2026
First seen29 Sep 2026
Sources
CVE-2019-6684 · NVD
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