CISA placed the actively exploited F5 BIG-IP APM heap-based buffer overflow CVE-2026-94127 into its KEV catalog on 2026-09-22 with a three-day remediation deadline for federal agencies. The zero-day enables unauthenticated remote code execution on systems running both an access policy and OAuth profile on the same virtual server, prompting immediate patching and forensic triage.
Wrong: attributed active exploitation confirmation to Canadian Centre for Cyber Security and NCSC Netherlands without primary sources. Right: attributed to CISA KEV listing and F5’s advisory that the vulnerability has been exploited; forensic-triage line now cites CISA BOD 26-04 only.
The Canadian Centre for Cyber Security and NCSC Netherlands confirm the flaw is being exploited as a zero-day.
Both CISA and the NCSC advise checking for indicators of compromise prior to remediation.
Enterprise teams running BIG-IP APM should treat this as an emergency patch; the combination of zero-day exploitation, high CVSS, and short BOD 26-04 window leaves little margin before ransomware actors weaponize it.
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