VulnerabilityModified
CVE-2019-9821
A use-after-free vulnerability can occur in AssertWorkerThread due to a race condition with shared workers.
HIGH 8.1EPSS 0.85%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.85%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.0
- 8.1 HIGHCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.85% probability · 56th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-362, CWE-416
- Affected
- mozilla/firefox
- Source
- security@mozilla.org
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.