CVE-2021-24023

Authenticated shell access via diagnose command injection

Published Jun 3, 2021 · Updated Oct 25, 2024

OS command injection in Fortinet FortiAI 1.4.0 and earlier allows local users to gain system shell access through the diagnose command. The diagnose command fails to neutralize shell metacharacters in an authenticated user's payload before passing it to the system shell. Successful exploitation requires a valid account with CLI access and grants command execution in the appliance's underlying system shell.

CVSS severity8.8
High
EPSS probability0.75%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in Fortinet FortiAI 1.4.0 and earlier allows local users to gain system shell access through the diagnose command. The diagnose command fails to neutralize shell metacharacters in an authenticated user's payload before passing it to the system shell. Successful exploitation requires a valid account with CLI access and grants command execution in the appliance's underlying system shell.

The record

CVE
CVE-2021-24023
Published
Jun 3, 2021
Updated
Oct 25, 2024
Vendor
Fortinet
Product
FortiAI
Classifications
CWE-78, T1059
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 3, 2021CVE publishedPublication date reported by the CVE source.
  2. Oct 25, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=FortiAI 1.4.0 and earlier

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Fortinet · FortiAIversion=FortiAI 1.4.0 and earlier

Published CVSS scores

7.8FortinetCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.0NIST NVDAV:N/AC:L/Au:S/C:C/I:C/A:C
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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