CVE-2019-5591A Default Configuration vulnerability in FortiOS may allow an unauthenticated attacker on the same subnet to intercept sensitive information by impersonating the LDAP server.
Updated under an hour ago ()
Does this affect you?
It affects Fortinet FortiOS. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Nov 3, 2021; federal agencies had to remediate by May 3, 2022, and it is known to be used in ransomware. Treat that date as your deadline.
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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
- 6.5 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weakness (CWE)
- CWE-306
- Known exploited
- Added to CISA KEV Nov 3, 2021; federal remediation due May 3, 2022; known ransomware useApply updates per vendor instructions.
- EPSS (exploitation in the next 30 days)
- 18.57% (percentile 97)
- Assigned by
- fortinet
- NVD analysis
- Analyzed
- Record last updated
- Aug 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Fortinet Fortinet FortiOS fortinet:fortios (from the name) | FortiOS 6.2.0 and below. | CNA record |
fortinet fortios fortinet:fortios | through 6.2.0 | NVD |
References
- https://www.fortiguard.com/psirt/FG-IR-19-037x-refsource-confirm, mitigation, vendor-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-5591us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.