What is CVE-2021-36182?

CVE-2021-36182 is a high-severity vulnerability in Fortinet Fortiweb, classified under OS Command Injection. CVSS score: 8.8/10. Published 2021-09-08.

How severe is CVE-2021-36182?

High severity. CVSS v3 base score is 8.8 out of 10.

RCE in Fortinet Fortiweb

CVE-2021-36182

A Improper neutralization of special elements used in a command ('Command Injection') in Fortinet FortiWeb version 6.3.13 and below allows attacker to execute unauthorized code or commands via crafted HTTP requests

Vulnerability class: Command Injection (OS Command Injection)

Published 2021-09-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.019 (79.1th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 79.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000

Affected products

Fortinet Fortiweb — versions FortiWeb 6.3.13, 6.3.12, 6.3.11, 6.3.10, 6.3.9, 6.3.8, 6.3.7, 6.3.6, 6.3.5, 6.3.4, 6.3.3, 6.3.2, 6.3.1, 6.3.0
Fortinet Fortiweb

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

fortiguard.com/advisory/FG-IR-21-047 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-36182?: CVE-2021-36182 is a high-severity vulnerability in Fortinet Fortiweb, classified under OS Command Injection. CVSS score: 8.8/10. Published 2021-09-08.
How severe is CVE-2021-36182?: High severity. CVSS v3 base score is 8.8 out of 10.