What is CVE-2021-26105?

CVE-2021-26105 is a medium-severity vulnerability in Fortinet Fortisandbox, classified under CWE-358. CVSS score: 6.8/10. Published 2025-03-24.

How severe is CVE-2021-26105?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Buffer overflow in Fortinet Fortisandbox

CVE-2021-26105

A stack-based buffer overflow vulnerability (CWE-121) in the profile parser of FortiSandbox version 3.2.2 and below, version 3.1.4 and below may allow an authenticated attacker to potentially execute unauthorized code or commands via specifically crafted HTTP requests.

Published 2025-03-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H.

EPSS exploit prediction

EPSS: 0.005 (40.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 40.6% 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 Fortisandbox — versions 3.1.4, 4.0.0, 3.2.2

Weakness classification (CWE)

References

fortiguard.fortinet.com/psirt/FG-IR-20-234 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-26105?: CVE-2021-26105 is a medium-severity vulnerability in Fortinet Fortisandbox, classified under CWE-358. CVSS score: 6.8/10. Published 2025-03-24.
How severe is CVE-2021-26105?: Medium severity. CVSS v3 base score is 6.8 out of 10.