F5 — Cyber Attacks, Breaches & Threat Activity

Threat entity extracted from intelligence sources

Frequency
33
occurrences
First Seen
October 23, 2025
Last Seen
June 19, 2026

F5 is an organization tracked by ThreatCluster, appearing in 23 threat clusters built from 33 intelligence report mentions.

F5 is a organization tracked across 23 threat clusters and 33 intelligence report mentions on ThreatCluster. First observed October 23, 2025; most recent activity June 19, 2026.

Related Threat Clusters

Recent Intelligence Reports

  • NGINX Vulnerability Patch: F5 Fixes Critical HTTP/3 and HTTP/2 Remote Code Execution Flaws — Techtimes · June 19, 2026
  • F5 Patches NGINX Vulnerability Enabling Code Execution and DoS Attacks — Gbhackers · June 18, 2026
  • F5 issues out-of — Bleepingcomputer · June 18, 2026
  • Ransomware crims got a month-long head start on Check Point VPN 0 — Theregister · June 8, 2026
  • F5 NGINX Plus & Open‑Source Flaw Lets Attackers Execute Code via MP4 File — Gbhackers · March 25, 2026
  • Kyndryl Cyber Defense Operations Center — Kyndryl · February 19, 2026
  • Cisco, F5 Patch High — Feeds.Feedburner · February 5, 2026
  • China's Typhoon hackers have changed the rules of cybersecurity — Scworld · January 30, 2026

Frequently asked questions

What is F5?

F5 is an organization tracked by ThreatCluster, appearing in 23 threat clusters built from 33 intelligence report mentions.

Is F5 still active?

The most recent intelligence report mentioning F5 on ThreatCluster is dated June 19, 2026. Activity was first observed October 23, 2025, giving a tracked span from then to June 19, 2026.

What is F5 associated with?

Across ThreatCluster reporting, F5 most frequently co-occurs with Apt38, BlueNoroff, Salt Typhoon, Sapphire Sleet, Scattered Spider, among 12 tracked related entities.

What are the latest developments involving F5?

The most significant recent cluster is “F5 Issues Critical Patches for NGINX Vulnerabilities Allowing Remote Code Execution” (24 articles · Updated June 18, 2026). F5 appears across 23 threat clusters in total, listed above with sources.

How much reporting does ThreatCluster have on F5?

F5 appears in 33 intelligence report mentions across 23 deduplicated threat clusters, aggregated from 17,000+ monitored sources.

CVSS v3.1 Breakdown