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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…
High8.1EPSS 0.85%
- Published
- Updated
- Reserved
- Assigned by
- mozilla
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.0 | High8.1 | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.85% · top 42% of all CVEs (7 Nov 2026)
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The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.1.
Weakness
- Use-after-free in AssertWorkerThread
- CWE-362 (opens in a new tab)All about CWE-362 and its CVEs
- CWE-416 (opens in a new tab)All about CWE-416 and its CVEs
Affected products
References (2)
- https://www.mozilla.org/security/advisories/mfsa2019-13/ (opens in a new tab)x_refsource_MISCx_transferred
- https://bugzilla.mozilla.org/show_bug.cgi?id=1539125 (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2019-9821)Record last updated .