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4 intel reports
Adversary c05d5254 uses the PoisonedRefresh rootkit to inject fileless PHP web shells into F5 BIG-IP APM memory via CVE-2025-53521 exploitation.
F5 BIG-IP APM is vulnerable to a critical unauthenticated remote code execution flaw (CVE-2026-94127) when configured as an OAuth Authorization Server, which is actively being exploited in the wild.
Cluster c05d5254 utilizes the PoisonedRefresh rootkit to inject fileless PHP web shells into F5 BIG-IP APM memory via CVE-2025-53521 exploitation.
An advanced threat actor, PoisonedRefresh, is exploiting CVE-2025-53521 in F5 BIG-IP systems to deploy a sophisticated Linux rootkit that injects in-memory PHP webshells.
