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CVE-2019-5591: Fortinet FortiOS Default Configuration Vulnerability

criticalknown exploitedpublic exploitCVE-2019-5591
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 contains a default configuration vulnerability that may allow an unauthenticated attacker on the same subnet to intercept sensitive information by impersonating the Lightweight Directory Access Protocol (LDAP) server.

CSIRTS triage

vendor: Fortinetproduct: FortiOSAuthentication bypassInformation disclosure
What
FortiOS contains a default configuration vulnerability that may allow an attacker to intercept sensitive information.
Who is affected
Unauthenticated attackers on the same subnet as FortiOS deployments.
Urgency
Immediate remediation is necessary due to the critical severity and active exploitation.
Action
Reconfigure FortiOS to eliminate the default settings that allow this vulnerability.

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-2019-5591

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-2019-5591coverage & exploitation statusNVD · CVE.org

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