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CVE-2020-7777

7.2 · HIGH

This affects all versions of package jsen.

Published Nov 23, 2020EPSS 2.11%

Overview

CVE-2020-7777 is a high-severity vulnerability. It was published on November 23, 2020 and has a CVSS 3.1 base score of 7.2 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.2, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

This affects all versions of package jsen. If an attacker can control the schema file, it could run arbitrary JavaScript code on the victim machine. In the module description and README file there is no mention about the risks of untrusted schema files, so I assume that this is applicable. In particular the required field of the schema is not properly sanitized. The resulting string that is build based on the schema definition is then passed to a Function.apply();, leading to an Arbitrary Code Execution.

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/bugventure/jsen/blob/master/lib/jsen.js%23L875Refsnyk.io/vuln/SNYK-JS-JSEN-1014670GitHubgithub.com/bugventure/jsen/blob/master/lib/jsen.js%23L875Refsnyk.io/vuln/SNYK-JS-JSEN-1014670

How CyberStrike helps

Frequently asked questions

What is CVE-2020-7777?

CVE-2020-7777 is a high-severity vulnerability. It was published on November 23, 2020 and has a CVSS 3.1 base score of 7.2 (HIGH).

How severe is CVE-2020-7777?

This vulnerability has a CVSS 3.1 base score of 7.2, 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-2020-7777?

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-2020-7777?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-7777 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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