F5 BIG-IP LTM systems 11.x prior to 11.2.1 HF16, 11.3.x, 11.4.x prior to 11.4.1 HF11, 11.5.0, 11.5.1 before HF11, 11.5.2, 11.5.3, 11.5.4 before HF2, 11.6.0 before HF8, 11.6.1 before HF1, 12.0.0 before HF4, and 12.1.0 before HF2 allow remote malicious users to modify or extract sy...