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CVE-2021-29440

HighPublished

Twig allowing dangerous PHP functions by default

Published: Apr 13, 2021
Updated: Aug 3, 2024
Assigning CNA: GitHub_M
Evidence observed: Jun 7, 2021

Primary CVSS

8.4/ 10High

nvd · CVSS 3.1

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

EPSS probability estimate

30.6%

Moderate · next 30 days

Percentile: 98.2%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2021-29440Exploit
Unsafe Twig processing of static pages leading to RCE in Grav CMS 1.7.10
Grav CMS 1.7.10 - Server-Side Template Injection (SSTI) (Authenticated)Exploit
enox · php · Jun 7, 2021

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