CVE-2021-29440

Twig allowing dangerous PHP functions by default

Severity Score

7.2

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Grav is a file based Web-platform. Twig processing of static pages can be enabled in the front matter by any administrative user allowed to create or edit pages. As the Twig processor runs unsandboxed, this behavior can be used to gain arbitrary code execution and elevate privileges on the instance. The issue was addressed in version 1.7.11.

Grav es una plataforma web basada en archivos. El procesamiento de Twig de páginas estáticas puede ser habilitado en la materia inicial por cualquier usuario administrativo autorizado para crear o editar páginas. Como el procesador Twig se ejecuta sin sandbox, este comportamiento puede ser usado para obtener una ejecución de código arbitraria y elevar los privilegios en la instancia. El problema se solucionó en la versión 1.7.11

Grav CMS version 1.7.10 suffers from a server-side template injection vulnerability.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

Single

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-03-30 CVE Reserved
2021-04-13 CVE Published
2021-06-06 First Exploit
2024-08-03 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-94: Improper Control of Generation of Code ('Code Injection')

CAPEC

References (7)

URL	Tag	Source
https://github.com/getgrav/grav/security/advisories/GHSA-g8r4-p96j-xfxc	Third Party Advisory
https://packagist.org/packages/getgrav/grav	Product

URL	Date	SRC
https://packetstorm.news/files/id/162987	2021-06-07
https://www.exploit-db.com/exploits/49961	2021-06-07
https://github.com/CsEnox/CVE-2021-29440	2021-06-06
http://packetstormsecurity.com/files/162987/Grav-CMS-1.7.10-Server-Side-Template-Injection.html	2024-08-03
https://blog.sonarsource.com/grav-cms-code-execution-vulnerabilities	2024-08-03

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Getgrav Search vendor "Getgrav"		Grav Search vendor "Getgrav" for product "Grav"				< 1.7.11 Search vendor "Getgrav" for product "Grav" and version " < 1.7.11"		-		Affected