FortiOS
CVE-2019-5591: FortiOS Default Configuration
A Default Configuration vulnerability in FortiOS may allow an unauthenticated attacker on the same subnet to intercept sensitive information by impersonating the LDAP server.
Published
ExploitedYes, in CISA KEVAdded 3 Nov 2021
Ransomware useKnownPer CISA
SeverityMEDIUMCVSS 3.1 6.5
EPSS19%Chance of exploitation in 30 days
Public exploitNot tracked
FixNot yet
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| Fortinet FortiOS FortiOS 6.2 | See the advisory |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
A Default Configuration vulnerability in FortiOS may allow an unauthenticated attacker on the same subnet to intercept sensitive information by impersonating the LDAP server.
Exploitation
CISA lists this CVE as exploited in the wild since 3 Nov 2021, including in ransomware campaigns.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 10 Oct 2026.