Bottom Line: A large-scale attack affects at least 74,000 Fortinet firewalls and compromises administrative access to security appliances at the core of enterprise networks.
Security researchers identified a large-scale attack on Fortinet firewalls affecting at least 74,000 devices. The exploit enables attackers to obtain administrative access to compromised appliances.
Designated FortiBleed, a critical vulnerability in Fortinet security appliances was exploited. Security researchers documented extensive brute-force attacks on affected systems with billions of attempted passwords, indicating a coordinated campaign.
The attacks target firewall administration interfaces to read configuration data and compromise authentication information. The persistence and scale of the compromise suggest that multiple systems have leaked administrative access.
For CISOs, this represents a significant risk: Fortinet appliances are often critical security components in enterprise networks. A compromise enables attackers to move freely within the internal network, bypass security policies, and potentially gain access to sensitive systems behind the firewall. Affected organizations should immediately check their Fortinet devices for indicators of compromise, review access accounts, and apply patches from Fortinet.
Source: www.heise.de · Published June 18, 2026
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