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Threat Intelligence
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2026-013: Critical Vulnerability in F5 BIG-IP APM

On 22 September 2026, F5 published an advisory addressing a critical vulnerability affecting its BIG-IP APM product. The vendor confirmed active exploitation in the wild.<br> CERT-EU recommends taking appropriate actions as soon as possible.<br>
CRITICAL
Severity & confidence
Source severitycritical
Platform severitycritical
Confidencehigh
Exploitationunknown
CVSS-
Affected
CountriesEU
Reporting sources (1)
CERT-EU - Security Advisories
Open source โ†—
Timeline & provenance
Published2026-09-22T16:53:16
Last updated2026-10-21T05:52:00
Ingested2026-09-22T16:53:16
FreshnessNEAR-REAL-TIME
Threat typeexploitation
Recommended action
No recommended action published with this item - review the original source.
Next steps
  1. Identify affected systems in your environment.
  2. Apply the vendor patch or mitigation guidance.
  3. Review logs for indicators described in the advisory.
  4. Follow the affected vendor/product to track updates.
Confidence explanation
Reported by a government or cert-grade source (CISA, NCSC, NVD, ENISA, MSRC).
Source type: gov ยท Original: CERT-EU - Security Advisories