What is CVE-2020-6640?

CVE-2020-6640 is a medium-severity vulnerability in Fortinet Fortianalyzer, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2020-06-04.

How severe is CVE-2020-6640?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Fortinet Fortianalyzer

CVE-2020-6640

An improper neutralization of input vulnerability in the Admin Profile of FortiAnalyzer may allow a remote authenticated attacker to perform a stored cross site scripting attack (XSS) via the Description Area.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-06-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.009 (56.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 56.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Fortinet Fortianalyzer
Fortinet Fortianalyzer — versions FortiAnalyzer 6.2.3, 6.2.2

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

fortiguard.com/advisory/FG-IR-20-003 (Vendor Advisory)

Frequently asked questions

What is CVE-2020-6640?: CVE-2020-6640 is a medium-severity vulnerability in Fortinet Fortianalyzer, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2020-06-04.
How severe is CVE-2020-6640?: Medium severity. CVSS v3 base score is 5.4 out of 10.