CVE-2025-53521
Act now ● On CISA KEV — actively exploited
Actively exploited — on the CISA KEV list.
CVSS base
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EPSS — probability of exploitation (30 days)
2.3%
82.5th percentile
CISA KEV
Listed
Added 2026-03-27 · patch by 2026-03-30
Weakness / dates
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Published — · modified —
Timeline
- 2026-03-27 — Added to CISA KEV (actively exploited)
- 2026-03-30 — CISA patch-by deadline
Description
F5 BIG-IP APM contains a stack-based buffer overflow vulnerability that could allow a threat actor to achieve remote code execution.