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#2 BleepingComputer general March 30, 2026 at 10:59 UTC

Hackers now exploit critical F5 BIG-IP flaw in attacks, patch now

By Sergiu Gatlan

AI Summary

F5 has reclassified CVE-2025-53521 from a high-severity denial-of-service flaw to a critical remote code execution vulnerability after discovering attackers are exploiting it to deploy webshells on unpatched BIG-IP devices. The vulnerability was initially disclosed in October 2025, and active exploitation is now confirmed in the wild.

Relevance score: 92.0/100

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