CVE-2019-11720

Description

Some unicode characters are incorrectly treated as whitespace during the parsing of web content instead of triggering parsing errors. This allows malicious code to then be processed, evading cross-site scripting (XSS) filtering. This vulnerability affects Firefox < 68.

Category

6.1
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.68% Top 30%
Vendor Advisory gentoo.org Vendor Advisory opensuse.org Vendor Advisory opensuse.org Vendor Advisory opensuse.org Vendor Advisory opensuse.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org
Affected: Mozilla Firefox
Published at:
Updated at:

References

Link Tags
https://www.mozilla.org/security/advisories/mfsa2019-21/ vendor advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1556230 vendor advisory issue tracking permissions required
https://security.gentoo.org/glsa/201908-12 third party advisory vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html vendor advisory mailing list third party advisory
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.html vendor advisory mailing list third party advisory
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00011.html vendor advisory mailing list third party advisory
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00017.html vendor advisory mailing list third party advisory

Frequently Asked Questions

What is the severity of CVE-2019-11720?
CVE-2019-11720 has been scored as a medium severity vulnerability.
How to fix CVE-2019-11720?
To fix CVE-2019-11720, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2019-11720 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2019-11720 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2019-11720?
CVE-2019-11720 affects Mozilla Firefox.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.