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CVE-2019-17020

6.5 · MEDIUM

If an XML file is served with a Content Security Policy and the XML file includes an XSL stylesheet, the Content Security Policy will not be applied to the contents of the XSL stylesheet.

Published Jan 8, 2020CWE-611EPSS 1.14%

Overview

CVE-2019-17020 is a medium-severity vulnerability. It was published on January 8, 2020 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

If an XML file is served with a Content Security Policy and the XML file includes an XSL stylesheet, the Content Security Policy will not be applied to the contents of the XSL stylesheet. If the XSL sheet e.g. includes JavaScript, it would bypass any of the restrictions of the Content Security Policy applied to the XML document. This vulnerability affects Firefox < 72.

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

Refbugzilla.mozilla.org/show_bug.cgi?id=1597645Refusn.ubuntu.com/4234-1/Refwww.mozilla.org/security/advisories/mfsa2020-01/Refbugzilla.mozilla.org/show_bug.cgi?id=1597645Refusn.ubuntu.com/4234-1/Refwww.mozilla.org/security/advisories/mfsa2020-01/

How CyberStrike helps

Frequently asked questions

What is CVE-2019-17020?

CVE-2019-17020 is a medium-severity vulnerability. It was published on January 8, 2020 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2019-17020?

This vulnerability has a CVSS 3.1 base score of 6.5, 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-2019-17020?

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-2019-17020?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-17020 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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