10,000+ Fortinet Firewalls Still Exposed to 5

Cybersecuritynews • January 2, 2026

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... ransomware actors leveraged it.. In December 2025, Fortinet issued ... ransomware or lateral movement within breached networks.. on ...

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Over 10,000 Fortinet Firewalls Vulnerable to MFA Bypass Flaw More than 10,000 Fortinet firewalls globally are still exposed to CVE-2020-12812, a multi-factor authentication bypass vulnerability. This flaw, linked to improper authentication in FortiOS SSL VPN, was disclosed over five years ago and remains actively exploited, as confirmed by Fortinet in late 2025. 2 sources 35

Extracted Entities

Attack Types (2)

Lateral Movement Ransomware

Platforms (1)

Fortinet Firewalls