CVE-2019-5591
Fortinet FortiOS Default Configuration Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.
Required action
Apply updates per vendor instructions.
CISA notes
https://nvd.nist.gov/vuln/detail/CVE-2019-5591
Description
A Default Configuration vulnerability in FortiOS may allow an unauthenticated attacker on the same subnet to intercept sensitive information by impersonating the LDAP server.
Severity
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NExploitation Context
as of October 15, 2026- CISA added CVE-2019-5591 to the KEV catalog 446 days after its CVE record was published.
- It is one of 31 Fortinet entries in the CISA KEV catalog, and one of 4 added in 2021.
- Its current EPSS score (18.6%) is higher than that of 33% of CISA KEV entries.
Affected Products
| Vendor | Product | Affected versions |
|---|---|---|
| Fortinet | Fortinet Fortinet FortiOS | FortiOS 6.2.0 and below. |
References
1 LinksRecord Details
More from Fortinet
Fortinet FortiOS SSL VPN Path Traversal Vulnerability
Fortinet FortiOS Heap-Based Buffer Overflow Vulnerability
Fortinet FortiOS Out-of-Bound Write Vulnerability
Fortinet FortiOS SSL VPN Improper Authentication Vulnerability
CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.