CVE DATABASE / CVE-2019-5591
CVE-2019-5591
Fortinet FortiOS Default Configuration Vulnerability
CVSS 6.5 · MEDIUM
⚠ CISA KEV — ACTIVELY EXPLOITED
On the CISA KEV catalog
Confirmed exploited in the wild. Added 2021-11-03.
Federal remediation due 2022-05-03.
Required action: Apply updates per vendor instructions.
Summary
A Default Configuration vulnerability in FortiOS may allow an unauthenticated attacker on the same subnet to intercept sensitive information by impersonating the LDAP server.
CVSS 3.1 breakdown
| Base score | 6.5 (MEDIUM) |
| Vector | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| Attack vector | ADJACENT_NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity | NONE |
| Availability | NONE |
Weakness type (CWE)
Affected products
Fortinet fortios
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References
- https://www.fortiguard.com/psirt/FG-IR-19-037
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-5591
Data: NIST NVD + CISA KEV. NVD last modified 2025-10-24. Always verify against the vendor advisory before acting.