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FRONT PAGE / CYBER / CYB-2026-06-18-F2
CYBER · ransomware threat groups · 2026-06-18SCOOP 57

NCSC Issues Advice Following Global Targeting of Fortinet Firewalls and VPN Gateways

The UK NCSC published an alert on June 18 (updated June 22) urging organizations using Fortinet services to take action against a global campaign hitting FortiGate firewalls and VPN gateways with SSL VPN enabled.

·FILED ISSUE 2026-06-18·1 MIN READ·RE-VERIFIED 2026-07-02 UTC·✓ RE-VERIFIED 2026-07-02

At a glance

  • NCSC issued advice on June 18 after global targeting of FortiGate firewalls and SSL VPN gateways.
  • A threat actor leaked a credentials database built via brute-force, dictionary and credential-stuffing attempts.
  • NCSC recommends factory-resetting affected devices rather than just changing credentials.

VERDICT — CONFIRMED

pipeline-backfill confidence · primary + corroborating sources verified · re-verified 2026-07-02 UTC
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Generated desk illustration · The Dossier Wire · not a photograph

The UK NCSC published an alert on June 18 (updated June 22) urging organizations using Fortinet services to take action against a global campaign hitting FortiGate firewalls and VPN gateways with SSL VPN enabled. Per the alert, a threat actor leaked a database of credentials assembled through brute-force, dictionary and credential-stuffing attempts, with some indications of potential impact in the UK. NCSC advises checking for indicators of compromise including unauthorized accounts, factory-resetting affected devices rather than only changing credentials, isolating compromised devices, and hardening by disabling internet-exposed management interfaces and enforcing multi-factor authentication.

Key facts on file

  • NCSC issued advice on June 18 after global targeting of FortiGate firewalls and SSL VPN gateways.
  • A threat actor leaked a credentials database built via brute-force, dictionary and credential-stuffing attempts.
  • NCSC recommends factory-resetting affected devices rather than just changing credentials.

OFFICIAL RECORD

UK NCSC — All Updates
— (2026-06-18) · fetched at filing · archived at publication
Filed underVPNCREDENTIALS

Sources · two-source rule

PRIMARY · DOCUK NCSC — All Updates— (2026-06-18)
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Filed by the Cyber desk · verified by the verification desk · re-verified 2026-07-02 · Our standards: the two-source rule ›
CITE THIS FILE — The Dossier Wire · cyb-2026-06-18-f2 · filed 2026-06-18 · https://thedwire.com/wire/cyb-2026-06-18-f2-ncsc-issues-advice-following-global-targeting-of-fortinet.html · Primary and corroborating sources listed above; archived at publication. Republishing & licensing: hello@thedwire.com.
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