RansomwarecriticalExploited in the wild

Five-year-old Fortinet FortiOS SSL VPN flaw actively exploited

Security Affairsby @securityaffairsDec 25, 2025 · 19:40 UTC (Dec 25, 2025)3 min read2

Read at securityaffairs.com

Analyze this story with Vani AIImpact, who is affected and what defenders should do, in a new chat

CVEs: CVE-2020-12812 CVE-2018-13379 CVE-2019-5591

Tags: cve-2020-12812 cve-2018-13379 cve-2019-5591 ransomware

Vulnerabilities mentioned

All

CVE	Vulnerability	CVSS	EPSS	Signals	Published
CVE-2018-13379	Unauthenticated Path Traversal in Fortinet FortiOS SSL VPN	9.8	100%	KEVRansomware	Jun 4, 2019 KEV Nov 3, 2021
CVE-2019-5591	Default-Configuration LDAP Impersonation in Fortinet FortiOS	6.5	19%	KEVRansomware	Aug 14, 2020 KEV Nov 3, 2021
CVE-2020-12812	MFA Bypass via Username Case Change in Fortinet FortiOS SSL VPN	9.8	45%	KEVRansomware	Jul 24, 2020 KEV Nov 3, 2021

From the original article

3 min read at securityaffairs.com

Fortinet reported active exploitation of a five-year-old FortiOS SSL VPN flaw, abused in the wild under specific configurations. Fortinet researchers observed “recent abuse” of a five-year-old security vulnerability, tracked as CVE-2020-12812 (CVSS score: 5. 2), in FortiOS SSL VPN.

Security Affairs

By @securityaffairs · securityaffairs.com

Read the full article at Security Affairs

A short excerpt; the article and its images belong to the publisher. Summary, key facts and assessment above are AI-written from the article and can be wrong.