Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

LogJams, DHE Parameters, and Other Obstacles to TLS Excellence

If you're presently volunteering to wear the hat of “SSL/TLS Vulnerability Manager”, then you’ve come to the realization that patching one vulnerability often raises others. In wake of revelations ab...
Published Jul 07, 2015
Version 1.0
security
TMOS
BAMcHenry's avatar
Ret. Employee
Brian McHenry leads product management for Security solutions on the BIG-IP, NGINX, and Distributed Cloud data planes. In this role, he sets strategy for the growing $750M annual business for the Advanced WAF, SSL Orchestrator, Access Policy Manager, and NGINX App Protect products. McHenry takes pride in enabling F5’s customers to be successful as well as in improving their security postures to make the Internet a safer place. McHenry works across multiple groups at F5, including the Strategy Office, Office of the CTO, Marketing, Services, Support, and Sales. He is also a published writer and a frequent speaker at infosec conferences and events. He is a co-founder of Security B-Sides NYC, and committed to giving back to the Infosec community.
View Profile
James_Murphy_26's avatar
James_Murphy_26
Icon for Nimbostratus rankNimbostratus
Mar 06, 2018

Where can I get the technical details of DH parameter rotation that you mention above? Some details around how often and the fact it is on by default (and which versions it is on by default for - if that’s applicable)

 

EDIT: Found it after Googling.

 

The particular support article that details how often is K16674: TLS vulnerability CVE-2015-4000

 

It states:

 

The BIG-IP system, by default, uses custom DHE groups that are unique per install and are not static. These custom groups are also refreshed on a regular basis with the interval of regeneration varied by version. The interval is every month on BIG-IP 10.1.0 thru 11.3.0, and every hour starting in BIG-IP 11.4.0. This is enabled by default.