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Alert: NCSC issues advice following global targeting of Fortinet firewalls and VPN gateways ↗ source

June 18, 2026 NCSC Advisory

Summary

Credential stuffing is a method where attackers use passwords stolen from one web service to try to access accounts on other services, taking advantage of any reuse of username and password combinations. Organisations using these products should prioritise investigating whether they have been affected and, as soon as possible, follow mitigation advice to help defend against the threat. Use one of the FortiBleed asset checkers for any domains that may have been affected: Hudson Rock’s FortiBleed Checker device and monitor their network for unusual activity. Fortinet has published a blog post providing guidance and an analysis. Check SOCRadar's FortiBleed Checker or Hudson Rock’s FortiBleed Checker for any domains that are not listed in their 2.

News Coverage

No coverage found in monitored research blogs or news feeds.

CVEs Referenced in This Publication

No CVEs are referenced in this publication.

Vendors Named in This Publication

Each vendor links to its Known Exploited Vulnerabilities catalog page. Only vendors that appear in the KEV catalog are listed, either because the publication cites one of their KEV entries or because it names them directly.