CVE entry · CVE-2026-94127
CVE-2026-94127: F5 BIG-IP APM Heap-based Buffer Overflow Vulnerability
F5 BIG-IP APM contains a heap-based buffer overflow vulnerability when access policy and an OAuth profile are configured on a virtual server. This vulnerability could allow an unauthenticated attacker to perform remote code execution.
- Actively exploited: added to CISA’s KEV catalog on September 22, 2026.
- Use by ransomware: not established so far.
- Remediation deadline for US federal agencies: September 25, 2026.
Description from CISA’s KEV catalog.
What to do
- Check whether your estate includes F5 BIG-IP APM, including internet-facing devices.
- Apply the vendor’s patch or mitigations (references below). Failing that, isolate the product or stop using it, as CISA requires of US federal agencies.
- An exploited vulnerability has often been used before it was fixed: look for signs of compromise, especially on internet-facing devices.