XSS in Mozilla Firefox
CVE-2019-17016
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.020 (79.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 79.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.020 · newest: 0.020 · change: 0.000
Affected products
- Mozilla Firefox — versions before 72
- Mozilla Firefox Esr — versions before 68.4
- Mozilla Firefox Esr
- Canonical Ubuntu Linux — versions 16.04, 18.04, 19.04
- Debian Linux — versions 8.0, 9.0, 10.0
- Red Hat Enterprise Linux Desktop — versions 6.0, 7.0
- Red Hat Enterprise Linux Server — versions 6.0, 7.0
- Red Hat Enterprise Linux Server Aus — versions 7.7
- Red Hat Enterprise Linux Server Tus — versions 7.7
- Red Hat Enterprise Linux Workstation — versions 6.0, 7.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.mozilla.org/show_bug.cgi (Permissions Required)
- www.mozilla.org/security/advisories/mfsa2020-01/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2020-02/ (Vendor Advisory)
- seclists.org/bugtraq/2020/Jan/12 (mailing-list, Mailing List, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2020/01/msg00005.html (mailing-list, Mailing List, Third Party Advisory)
- www.debian.org/security/2020/dsa-4600 (vendor-advisory, Third Party Advisory)
- usn.ubuntu.com/4234-1/ (vendor-advisory, Third Party Advisory)
- seclists.org/bugtraq/2020/Jan/18 (mailing-list, Mailing List, Third Party Advisory)
- access.redhat.com/errata/RHSA-2020:0085 (vendor-advisory, Third Party Advisory)
- access.redhat.com/errata/RHSA-2020:0086 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2019-17016?
- CVE-2019-17016 is a medium-severity vulnerability in Mozilla Firefox, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-01-08.
- How severe is CVE-2019-17016?
- Medium severity. CVSS v3 base score is 6.1 out of 10.
- Is CVE-2019-17016 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.