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Background for this topic.
Fortinet is a cybersecurity vendor best known for FortiGate, a network firewall platform running FortiOS. FortiGate appliances, virtual machines, and cloud deployments provide traffic filtering, VPN access, intrusion prevention, and network segmentation; related products manage devices, collect security telemetry, or protect endpoints. FortiGuard Labs supplies threat intelligence and detection updates used across parts of this ecosystem.
Fortinet matters to security teams because its devices commonly sit at network boundaries and may expose administrative interfaces or SSL-VPN services to the internet. Vulnerabilities in FortiOS or supporting products can therefore create a path to authentication bypass, unauthorized access, or interception of remote connections when affected configurations are present. Practitioners should track Fortinet advisories, promptly apply firmware and signature updates, restrict management access, use multifactor authentication where supported, and monitor device logs and configuration changes. During an incident, preserve firewall and VPN telemetry and review connected systems rather than treating the appliance as an isolated asset.
A new multi-stage phishing campaign has been observed targeting users in Russia with ransomware and a remote access trojan called Amnesia RAT
Fix didn't quite do the job – attackers spotted logging in Fortinet has confirmed that attackers are actively bypassing a December patch for a critical FortiCloud single sign-on (SSO) authentication flaw after customers reported suspicious logins on devices supposedly fully up to date.…
Fortinet has officially confirmed that it's working to completely plug a FortiCloud SSO authentication bypass vulnerability following reports of fresh exploitation activity on fully-patched firewalls
Days after admins began reporting that their fully patched firewalls are being hacked, Fortinet confirmed it's working to fully address a critical FortiCloud SSO authentication bypass vulnerability that should have already been patched since early December. [...]
Automated infections of potentially fully patched FortiGate devices are allowing threat actors to steal firewall configuration files.
Fortinet FortiGate devices are being targeted in automated attacks that create rogue accounts and steal firewall configuration data, according to cybersecurity company Arctic Wolf. [...]
Cybersecurity company Arctic Wolf has warned of a "new cluster of automated malicious activity" that involves unauthorized firewall configuration changes on Fortinet FortiGate devices
Chinese Attackers Among Those Tied to Attempted Exploits of FortiSIEM AppliancesCritical vulnerabilities in edge devices are continuing to be discovered by security researchers and rapidly targeted by attackers. Lately, this includes a critical vulnerability in Fortinet's FortiSIEM appliances, which Chinese and other hackers began targeting just two days post-patch.
Fortinet customers are seeing attackers exploiting a patch bypass for a previously fixed critical FortiGate authentication vulnerability (CVE-2025-59718) to hack patched firewalls. [...]
In cybersecurity, the line between a normal update and a serious incident keeps getting thinner. Systems that once felt reliable are now under pressure from constant change. New AI tools, connected devices, and automated systems quietly create more ways in, often faster than security teams can react. This week’s stories show how easily a small mistake or hidden service can turn into a real