What’s Vulnerable › Vulnerabilities

CVE-2019-17017

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.5% 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-843

Description

Due to a missing case handling object types, a type confusion vulnerability could occur, resulting in a crash. We presume that with enough effort that it could be exploited to run arbitrary code. 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=1603055

Get alerted when CVE-2019-17017 or the next vulnerability affects your stack