CVE-2019-5591
Fortinet FortiOS: Default Configuration
As of , CVE-2019-5591 in Fortinet FortiOS is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch this week.
- Exploited
- Yes: CISA listed it on 3 November 2021
- US federal deadline
- 3 May 2022181 days after CISA listed it. US federal civilian agencies must fix it by then.
- Used in ransomware campaigns
- KnownCISA changed it from Unknown to Known on 14 August 2026.
- EPSS score
- 0.18Higher than 97% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
- EPSS when listed
- Not availableCISA listed it before 4 February 2022, where the EPSS files we read begin.
- Public exploit
- None foundNeither Metasploit nor Exploit-DB lists one.
- Fix
- No vendor link in CISA's entry
What CISA says to do
Apply updates per vendor instructions.
CISA's required action
What the flaw is
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.
CISA's 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.
The CVE record's description, from fortinet
- CVE published
- 14 August 2020
- Assigned by
- fortinet
- CVSS
- 6.5 Medium (CVSS 3.1, from CISA-ADP)
- CWE-306
- Missing Authentication for Critical Function
- CISA SSVC, exploitation
- active
- CISA SSVC, automatable
- no
- CISA SSVC, technical impact
- partial
Timeline
- The CVE record was published.
- CISA added it to its list of exploited vulnerabilities.
- The US federal deadline to fix it.
- CISA changed its entry. Ransomware use: Unknown to Known.
FortiOS: other exploited entries
| Vulnerability | Product | Our group | Listed | Deadline | EPSS |
|---|---|---|---|---|---|
| CVE-2018-13379SSL VPN Path Traversal | Fortinet FortiOS | Patch this weekRansomware use; Metasploit module; EPSS 0.99 | 0.99 | ||
| CVE-2024-21762Out-of-Bound Write | Fortinet FortiOS | Patch this weekRansomware use; EPSS 0.83 | 0.83 | ||
| CVE-2022-42475Heap-Based Buffer Overflow | Fortinet FortiOS | Patch this weekRansomware use; EPSS 0.99 | 0.99 | ||
| CVE-2020-12812SSL VPN Improper Authentication | Fortinet FortiOS | Patch this weekRansomware use | 0.45 | ||
| CVE-2019-6693Use of Hard-Coded Credentials | Fortinet FortiOS | Patch this weekRansomware use | 0.06 | ||
| CVE-2025-68686Exposure of Sensitive Information to an Unauthorized Actor | Fortinet FortiOS | Patch soon | 0.30 | ||
| CVE-2022-41328Path Traversal | Fortinet FortiOS | Patch soon | 0.11 | ||
| CVE-2021-44168Arbitrary File Download | Fortinet FortiOS | Patch soon | 0.01 |
Read further
- CVE recordcve.org
- NVD entrynvd.nist.gov
- CISA's catalogcisa.gov
- EPSS for this CVEapi.first.org