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CVE-2021-29440

8.4 · HIGH

Grav is a file based Web-platform.

Published Apr 13, 2021CWE-94EPSS 30.62%

Overview

CVE-2021-29440 is a high-severity vulnerability. It was published on April 13, 2021 and has a CVSS 3.1 base score of 8.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.4, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refpacketstormsecurity.com/files/162987/Grav-CMS-1.7.10-Server-Side-Template-Injection.htmlRefblog.sonarsource.com/grav-cms-code-execution-vulnerabilitiesGitHubgithub.com/getgrav/grav/security/advisories/GHSA-g8r4-p96j-xfxcRefpackagist.org/packages/getgrav/gravRefpacketstormsecurity.com/files/162987/Grav-CMS-1.7.10-Server-Side-Template-Injection.htmlRefblog.sonarsource.com/grav-cms-code-execution-vulnerabilitiesGitHubgithub.com/getgrav/grav/security/advisories/GHSA-g8r4-p96j-xfxcRefpackagist.org/packages/getgrav/grav

How CyberStrike helps

Frequently asked questions

What is CVE-2021-29440?

CVE-2021-29440 is a high-severity vulnerability. It was published on April 13, 2021 and has a CVSS 3.1 base score of 8.4 (HIGH).

How severe is CVE-2021-29440?

This vulnerability has a CVSS 3.1 base score of 8.4, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-29440?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-29440?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-29440 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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