CVE-2019-5591

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 v3.1

6.5 MEDIUMCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1

6.5 MEDIUMCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v2.0

3.3 LOWAV:A/AC:L/Au:N/C:P/I:N/A:N

EPSS

18.42% chance of exploitation in the next 30 days, 97th percentile

CISA KEV

added 2021-11-03, used in ransomware campaigns

Nuclei

medium

Published

2020-08-14

Updated

2026-08-15

Proof-of-concept exploits (1)

• ayewo/fortios-ldap-mitm-poc-CVE-2019-5591

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2019/CVE-2019-5591.yaml

References

• CVE Record
• NVD entry

Related

• CVE-2019-5544
• CVE-2019-5596
• CVE-2019-5526
• CVE-2019-5602
• CVE-2019-5512
• CVE-2019-5603