CVE-2021-33816Public exploitNetwork attack vector

Authenticated code execution via unblocked PHP backticks

Published Nov 10, 2021 · Updated Aug 3, 2024

Code injection in Dolibarr 13.0.2 allows remote authenticated users to execute PHP and operating system commands through the website builder. The website source-update path accepts PHP page content and blocks named execution functions but fails to reject backtick shell-execution syntax. An authenticated session with permission to edit website content is required, and successful exploitation runs commands with the web server's privileges.

CVSS severity9.8
Critical
EPSS probability3.94%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Dolibarr 13.0.2 allows remote authenticated users to execute PHP and operating system commands through the website builder. The website source-update path accepts PHP page content and blocks named execution functions but fails to reject backtick shell-execution syntax. An authenticated session with permission to edit website content is required, and successful exploitation runs commands with the web server's privileges.

The record

CVE
CVE-2021-33816
Published
Nov 10, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-94, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 10, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.1Trovent Security GmbHCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1059.004Command and Scripting Interpreter: Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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