What is CVE-2019-5587?

CVE-2019-5587 is a medium-severity vulnerability in Fortinet Fortios, classified under Insufficient Verification of Data Authenticity. CVSS score: 6.5/10. Published 2019-06-04.

How severe is CVE-2019-5587?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Fortinet Fortios

CVE-2019-5587

Lack of root file system integrity checking in Fortinet FortiOS VM application images all versions below 6.0.5 may allow attacker to implant malicious programs into the installing image by reassembling the image through specific methods.

Published 2019-06-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.005 (38.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 38.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: -0.000

Affected products

Fortinet Fortios — versions FortiOS all versions below 6.0.5
Fortinet Fortios

Weakness classification (CWE)

CWE-345 — Insufficient Verification of Data Authenticity

References

fortiguard.com/advisory/FG-IR-19-017 (Vendor Advisory)
www.securityfocus.com/bid/108628 (vdb-entry, Broken Link)

Frequently asked questions

What is CVE-2019-5587?: CVE-2019-5587 is a medium-severity vulnerability in Fortinet Fortios, classified under Insufficient Verification of Data Authenticity. CVSS score: 6.5/10. Published 2019-06-04.
How severe is CVE-2019-5587?: Medium severity. CVSS v3 base score is 6.5 out of 10.