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

Knowledge sharing: High CPU/Memory/Swap investigation/troubleshooting

I will share some basic knowedge about troubleshooting and resolving high data plane or contol plane CPU. First there is an already great article, so first check it: https://devcentral.f5.com/...
Updated Jul 19, 2022
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Nikoolayy1's avatar
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NGFW and WAF Tech Expert with more than 5 years of experience in the field of Cybersecurity, Automation, Orchestration and over 10 years in IT.
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StephanManthey
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Jul 20, 2022

Nice summary, thanks a lot Nikoolayy1 .

Monitoring might be a reason for constantly high CPU.

The way tcp_half_open was implemented, could cause a high CPU base line. As well a huge number of https monitors.

Regarding ICMP, TCP, HTTP and HTTPS monitors we can now use the In-TMM monitoring as described here:

K11323537: Configuring In-TMM monitoring