What’s Vulnerable › Vulnerabilities
CVE-2019-17016
- Severity: medium (CVSS 6.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 2.0% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2020-01-08 · updated 2026-06-17
- Weakness: CWE-79
Description
When pasting a <style> tag from the clipboard into a rich text editor, the CSS sanitizer incorrectly rewrites a @namespace rule. This could allow for injection into certain types of websites resulting in data exfiltration. This vulnerability affects Firefox ESR < 68.4 and Firefox < 72.
Affected products
- Canonical Ubuntu Linux: 16.04, 18.04, 19.04, 19.10
- Debian Linux: 8.0, 9.0, 10.0
- Mozilla Firefox: before 72.0 — fixed in 72.0
- Mozilla Firefox ESR: before 68.4 — fixed in 68.4
- RedHat Enterprise Linux Desktop: 6.0, 7.0
- RedHat Enterprise Linux Server: 6.0, 7.0
- RedHat Enterprise Linux Server Aus: 7.7
- RedHat Enterprise Linux Server Tus: 7.7
- RedHat Enterprise Linux Workstation: 6.0, 7.0
How to fix
Upgrade to a fixed version: Mozilla Firefox 72.0; Mozilla Firefox ESR 68.4. Check the vendor advisory for mitigations.
References
- http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00029.html
- http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00043.html
- http://packetstormsecurity.com/files/155912/Slackware-Security-Advisory-mozilla-thunderbird-Updates.html
- https://access.redhat.com/errata/RHSA-2020:0085
- https://access.redhat.com/errata/RHSA-2020:0086
- https://access.redhat.com/errata/RHSA-2020:0111
- https://access.redhat.com/errata/RHSA-2020:0120
- https://access.redhat.com/errata/RHSA-2020:0123
- https://access.redhat.com/errata/RHSA-2020:0127
- https://access.redhat.com/errata/RHSA-2020:0292
- https://access.redhat.com/errata/RHSA-2020:0295
- https://bugzilla.mozilla.org/show_bug.cgi?id=1599181
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