CVE-2019-17008

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.9% 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-416

Description

When using nested workers, a use-after-free could occur during worker destruction. This resulted in a potentially exploitable crash. This vulnerability affects Thunderbird < 68.3, Firefox ESR < 68.3, and Firefox < 71.

Affected products

Mozilla Firefox: before 71.0 — fixed in 71.0
Mozilla Firefox ESR: before 68.3 — fixed in 68.3
Mozilla Thunderbird: before 68.3 — fixed in 68.3
openSUSE Leap: 15.1

How to fix

Upgrade to a fixed version: Mozilla Firefox 71.0; Mozilla Firefox ESR 68.3; Mozilla Thunderbird 68.3. Check the vendor advisory for mitigations.

References

http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00000.html
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00001.html
https://access.redhat.com/errata/RHSA-2020:0292
https://access.redhat.com/errata/RHSA-2020:0295
https://bugzilla.mozilla.org/show_bug.cgi?id=1546331
https://security.gentoo.org/glsa/202003-02
https://security.gentoo.org/glsa/202003-10
https://usn.ubuntu.com/4241-1/
https://usn.ubuntu.com/4335-1/
https://www.mozilla.org/security/advisories/mfsa2019-36/
https://www.mozilla.org/security/advisories/mfsa2019-37/
https://www.mozilla.org/security/advisories/mfsa2019-38/

Get alerted when CVE-2019-17008 or the next vulnerability affects your stack