CVE-2019-9821
UnknownEPSS 0.85%
Last modified
CVE-2019-9821 is a vulnerability of currently unknown severity. A use-after-free vulnerability can occur in AssertWorkerThread due to a race condition with shared workers. This results in a potentially exploitable crash. EPSS estimates a 0.85% chance of exploitation in the next 30 days.
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 67.0 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1539125Permissions Required, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2019-13/Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1539125Permissions Required, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2019-13/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2019-9821?
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?
Severity scoring for CVE-2019-9821 is pending analysis. The EPSS model estimates a 0.85% probability of exploitation in the next 30 days.
How do I fix CVE-2019-9821?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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Are you affected by CVE-2019-9821?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST