CVE-2021-26096

Name: CVE-2021-26096
Creator: NVD / NIST
Published: 2021-08-04T18:15:09.377+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.77%

Last modified Jun 17, 2026

CVE-2021-26096 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Multiple instances of heap-based buffer overflow in the command shell of FortiSandbox before 4.0.0 may allow an authenticated attacker to manipulate memory and alter its content by means of specifically crafted command line arguments.. EPSS estimates a 0.77% chance of exploitation in the next 30 days.

Description

Multiple instances of heap-based buffer overflow in the command shell of FortiSandbox before 4.0.0 may allow an authenticated attacker to manipulate memory and alter its content by means of specifically crafted command line arguments.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.77%

50.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Fortinet	Fortisandbox	<= 3.1.4
Fortinet	Fortisandbox	>= 3.2.0, < 3.2.3

References

https://fortiguard.com/advisory/FG-IR-20-188Vendor Advisory
https://fortiguard.com/advisory/FG-IR-20-188Vendor Advisory

Timeline

Published: Aug 4, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-26096?

How severe is CVE-2021-26096?

CVE-2021-26096 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.77% probability of exploitation in the next 30 days.

How do I fix CVE-2021-26096?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-26096?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST