CVE-2019-9821

HighCVSS 8.1/10Last modified Jun 17, 2026

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

CVSS 3.0 8.1/10CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-362 CWE-416

Affected software

Vendor	Product	Versions
Mozilla	Firefox	>= unspecified, < 67

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: Jul 23, 2019
Last modified: Jun 17, 2026
NVD status: Modified

Related CVEs from 2019

CVE-2019-98239.8In several JetBrains IntelliJ IDEA versions, creating remote run configurations of JavaEE application servers leads to saving a cleartext re CVE-2019-98245.5tcp_emu in slirp/tcp_subr.c (aka slirp/src/tcp_subr.c) in QEMU 3.0.0 uses uninitialized data in an snprintf call, leading to Information dis CVE-2019-98259.8FeiFeiCMS 4.1.190209 allows remote attackers to upload and execute arbitrary PHP code by visiting index.php?s=Admin-Index to modify the set CVE-2019-98267.5The fulltext search component in phpBB before 3.2.6 allows Denial of Service.CVE-2019-98279.8Hawt Hawtio through 2.5.0 is vulnerable to SSRF, allowing a remote attacker to trigger an HTTP request from an affected server to an arbitra CVE-2019-98298.8Maccms 10 allows remote attackers to execute arbitrary PHP code by entering this code in a template/default_pc/html/art Edit action. This oc CVE-2019-98317.5The AirMore application through 1.6.1 for Android allows remote attackers to cause a denial of service (system hang) via many simultaneous /CVE-2019-98327.5The AirDrop application through 2.0 for Android allows remote attackers to cause a denial of service via a client that makes many socket con CVE-2019-98337.5The Screen Stream application through 3.0.15 for Android allows remote attackers to cause a denial of service via many simultaneous /start-s CVE-2019-98346.1The Netdata web application through 1.13.0 allows remote attackers to inject their own malicious HTML code into an imported snapshot, aka HT CVE-2019-98359.6The receiver (aka bridge) component of Fujitsu Wireless Keyboard Set LX901 GK900 devices allows Keystroke Injection. This occurs because it CVE-2019-98365.3Secure Encrypted Virtualization (SEV) on Advanced Micro Devices (AMD) Platform Security Processor (PSP; aka AMD Secure Processor or AMD-SP)