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CVE-2021-32817

5.4 · MEDIUM

express-hbs is an Express handlebars template engine.

Published May 14, 2021CWE-200EPSS 1.27%

Overview

CVE-2021-32817 is a medium-severity vulnerability. It was published on May 14, 2021 and has a CVSS 3.1 base score of 5.4 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.4, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

express-hbs is an Express handlebars template engine. express-hbs mixes pure template data with engine configuration options through the Express render API. More specifically, the layout parameter may trigger file disclosure vulnerabilities in downstream applications. This potential vulnerability is somewhat restricted in that only files with existing extentions (i.e. file.extension) can be included, files that lack an extension will have .hbs appended to them. For complete details refer to the referenced GHSL-2021-019 report. Notes in documentation have been added to help users of express-hbs avoid this potential information exposure vulnerability.

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

GitHubgithub.com/TryGhost/express-hbs#%EF%B8%8F-this-creates-a-potential-security-vulnerabilityGitHubgithub.com/TryGhost/express-hbs/commit/ff6fad6e357699412d4e916273314e5e7af1500eGitHubsecuritylab.github.com/advisories/GHSL-2021-019-express-hbs/Refwww.npmjs.com/package/express-hbsGitHubgithub.com/TryGhost/express-hbs#%EF%B8%8F-this-creates-a-potential-security-vulnerabilityGitHubgithub.com/TryGhost/express-hbs/commit/ff6fad6e357699412d4e916273314e5e7af1500eGitHubsecuritylab.github.com/advisories/GHSL-2021-019-express-hbs/Refwww.npmjs.com/package/express-hbs

How CyberStrike helps

Frequently asked questions

What is CVE-2021-32817?

CVE-2021-32817 is a medium-severity vulnerability. It was published on May 14, 2021 and has a CVSS 3.1 base score of 5.4 (MEDIUM).

How severe is CVE-2021-32817?

This vulnerability has a CVSS 3.1 base score of 5.4, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-32817?

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-2021-32817?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-32817 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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