CVE-2019-9821: Race Condition
A use-after-free vulnerability can occur in AssertWorkerThread due to a race condition with shared workers. This results in a potentially exploitable crash.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Firefoxto a version that resolves this vulnerability.Fixed in 67 - Upgrade
Upgrade
debian/firefoxto a version that resolves this vulnerability.Fixed in 154.0.1-1
Event History
Peer vulnerabilities
Found alongside the following vulnerabilities.
Frequently Asked Questions
What is CVE-2019-9821?
CVE-2019-9821 is a use-after-free vulnerability that can occur in AssertWorkerThread due to a race condition with shared workers.
How does CVE-2019-9821 affect Firefox?
CVE-2019-9821 affects Firefox versions prior to 67.
What is the severity of CVE-2019-9821?
CVE-2019-9821 has a severity score of 8.1, which is considered high.
How can I fix CVE-2019-9821?
To fix CVE-2019-9821, update Firefox to version 67 or later.
Where can I find more information about CVE-2019-9821?
You can find more information about CVE-2019-9821 on the following references: [Bugzilla](https://bugzilla.mozilla.org/show_bug.cgi?id=1539125), [Mozilla Security Advisories](https://www.mozilla.org/en-US/security/advisories/mfsa2019-13/)