2026-013 Critical Vulnerability in F5 BIG-IP APM — CERT-EU-SA2026-013

Summary

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. CERT-EU recommends taking appropriate actions as soon as possible.

Timeline

Published by source

2026-09-22

Risk context

• The source data marks this issue as actively exploited; remediation should be prioritized.
• Reported severity or threat level: critical.
• Review exposure for the affected product or family: Security advisory.

Product

Security advisory

What to do

General, cautious steps (verify details in the official source):

• Prioritize patching or mitigation immediately (treat as actively risky).
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Check logs/telemetry for indicators of compromise and suspicious activity.
• Consider temporary hardening: restrict access, reduce attack surface, and monitor aggressively.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source

Evidence and provenance

Canonical advisory ID

CERT-EU-SA2026-013

Source

CERT-EU

Vendor

CERT-EU

Published by source

2026-09-22

Last source activity

2026-09-22

Curated by

hlukh.ch

Related advisories and connections

These advisories are connected by shared CVE, product, vendor, source, or time signals.