Medium severity · published Aug 14, 2020
CVE-2019-5591
Fortinet FortiOS Default Configuration Vulnerability
RansomwareIn wildKEV
6.5
CVSS
18.6%
EPSS
Yes
On KEV
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.
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Adjacent
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)18.6% · higher than 97% of CVEs
Exploited in the wildYes
CISA KEVListed Nov 3, 2021
Federal remediation dueMay 3, 2022
Ransomware campaign useKnown
Affected products
Which versions
FO
FortiOS · Fortinet
FortiOS 6.2.0 and below. · source: vendor, NVD, KEV
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-5591
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-5591
CISA KEV catalogue
https://www.cisa.gov/known-exploited-vulnerabilities-catalog
x_refsource_CONFIRM
https://www.fortiguard.com/psirt/FG-IR-19-037
More from FortiOS
9.8
CVE-2026-24858
Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel Vulnerability
9.8
CVE-2025-25249
Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability
9.8
CVE-2025-59718
Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability
9.8
CVE-2024-55591
Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability
9.8
CVE-2024-23113
Fortinet Multiple Products Format String Vulnerability