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CVE-2020-12812: Fortinet FortiOS SSL VPN Improper Authentication Vulnerability

criticalknown exploitedCVE-2020-12812
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Fortinet FortiOS SSL VPN contains an improper authentication vulnerability that may allow a user to login successfully without being prompted for the second factor of authentication (FortiToken) if they change the case in their username.

CSIRTS triage

vendor: Fortinetproduct: FortiOS SSL VPNAuthentication bypass
What
An improper authentication vulnerability allows login without second-factor authentication.
Who is affected
Users of Fortinet FortiOS SSL VPN are affected.
Urgency
Immediate remediation is necessary due to active exploitation and critical severity.
Action
Update to the latest version of FortiOS.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2021-11-03
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2020-12812

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2020-12812coverage & exploitation statusNVD · CVE.org

Recent advisories for Fortinet FortiOS SSL

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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