Vulnerability Description
A use-after-free vulnerability can occur in AssertWorkerThread due to a race condition with shared workers. This results in a potentially exploitable crash. This vulnerability affects Firefox < 67.
CVSS Score
8.1
HIGH
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 67.0 |
Related Weaknesses (CWE)
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1539125Permissions RequiredVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2019-13/Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1539125Permissions RequiredVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2019-13/Vendor Advisory
FAQ
What is CVE-2019-9821?
CVE-2019-9821 is a vulnerability with a CVSS score of 8.1 (HIGH). A use-after-free vulnerability can occur in AssertWorkerThread due to a race condition with shared workers. This results in a potentially exploitable crash. This vulnerability affects Firefox < 67.
How severe is CVE-2019-9821?
CVE-2019-9821 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-9821?
Check the references section above for vendor advisories and patch information. Affected products include: Mozilla Firefox.