Fortinet · FortiOS
CVE-2019-5591
Fortinet FortiOS Default Configuration Vulnerability
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.
CISA: 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.
What to do
Apply updates per vendor instructions.
Deadline for US federal agencies: May 3, 2022
- Added to the CISA list
- November 3, 2021
- Published
- August 14, 2020
- Severity
- Medium 6.5 CVSS 3.1
- Chance of attacks in the next 30 days (EPSS)
- 19% in the top 2.8% of all known vulnerabilities
- Weakness
- CWE-306
- More details
- NVD · CVE.org · CISA
All references (1)
More exploited flaws from Fortinet
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| Jul 27, 2026 | Exposure of Sensitive Information to an Unauthorized Actor | FortiOS | Medium 5.3 | 29% |
| Jun 25, 2025 | Use of Hard-Coded Credentials | FortiOS | Medium 6.5 | 6.6% |
| Feb 9, 2024 | Out-of-Bound Write | FortiOS | Critical 9.6 | 85% |
| Mar 14, 2023 | Path Traversal | FortiOS | Medium 6.5 | 11% |
| Dec 13, 2022 | Heap-Based Buffer Overflow | FortiOS | Critical 9.3 | 99.5% |
| Dec 10, 2021 | Arbitrary File Download | FortiOS | Low 3.3 | 0.9% |
| Nov 3, 2021 | SSL VPN Path Traversal | FortiOS | Critical 9.1 | >99.9% |
| Nov 3, 2021 | SSL VPN Improper Authentication | FortiOS | High 7.5 | 45% |
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.