CVE-2019-17020

Name: CVE-2019-17020
Creator: NVD / NIST
Published: 2020-01-08T22:15:12.577+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.15%

Last modified Jun 17, 2026

CVE-2019-17020 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 1.15% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

1.15%

62.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-611

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 72.0
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	18.04
Canonical	Ubuntu Linux	19.04
Canonical	Ubuntu Linux	19.10

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1597645Permissions Required
https://usn.ubuntu.com/4234-1/Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2020-01/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1597645Permissions Required
https://usn.ubuntu.com/4234-1/Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2020-01/Vendor Advisory

Timeline

Published: Jan 8, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-17020?

How severe is CVE-2019-17020?

CVE-2019-17020 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.15% probability of exploitation in the next 30 days.

How do I fix CVE-2019-17020?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-17020?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST