What is CVE-2021-26097?

CVE-2021-26097 is a high-severity vulnerability in Fortinet Fortisandbox, classified under OS Command Injection. CVSS score: 8.8/10. Published 2021-08-04.

How severe is CVE-2021-26097?

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

RCE in Fortinet Fortisandbox

CVE-2021-26097

An improper neutralization of special elements used in an OS Command vulnerability in FortiSandbox 3.2.0 through 3.2.2, 3.1.0 through 3.1.4, and 3.0.0 through 3.0.6 may allow an authenticated attacker with access to the web GUI to execute unauthorized code or commands via specifically crafted HTTP requests.

Vulnerability class: Command Injection (OS Command Injection)

Published 2021-08-04 · 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: 0.012 (66.8th percentile), scored 2026-10-20.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 66.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Fortinet Fortisandbox — versions FortiSandbox 3.2.2, 3.2.1, 3.2.0, 3.1.4, 3.1.3, 3.1.2, 3.1.1, 3.1.0, 3.0.6, 3.0.5, 3.0.4, 3.0.3, 3.0.2, 3.0.1, 3.0.0
Fortinet Fortisandbox

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

fortiguard.com/advisory/FG-IR-20-198 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-26097?: CVE-2021-26097 is a high-severity vulnerability in Fortinet Fortisandbox, classified under OS Command Injection. CVSS score: 8.8/10. Published 2021-08-04.
How severe is CVE-2021-26097?: High severity. CVSS v3 base score is 8.8 out of 10.