Critical severity · published Jul 23, 2019
CVE-2019-11691
A use-after-free vulnerability can occur when working with XMLHttpRequest (XHR) in an event loop, causing the XHR main thread to be called after it has been freed
9.8
CVSS
1.6%
EPSS
No
On KEV
Description
A use-after-free vulnerability can occur when working with XMLHttpRequest (XHR) in an event loop, causing the XHR main thread to be called after it has been freed. This results in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.7, Firefox < 67, and Firefox ESR < 60.7.
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.6% · higher than 75% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
Firefox · Mozilla
before 67.0 · source: NVD
FE
Firefox Esr · Mozilla
before 60.7 · source: NVD
TH
Thunderbird · Mozilla
before 60.7 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-11691
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-11691
Issue Tracking
https://bugzilla.mozilla.org/show_bug.cgi?id=1542465
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-13/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-14/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-15/
More from Firefox
10.0
CVE-2019-11708
Mozilla Firefox and Thunderbird Sandbox Escape Vulnerability
9.8
CVE-2024-9680
Mozilla Firefox Use-After-Free Vulnerability
9.8
CVE-2010-3765
Mozilla Multiple Products Remote Code Execution Vulnerability
9.6
CVE-2022-26486
Mozilla Firefox Use-After-Free Vulnerability
8.8
CVE-2023-5217
Google Chromium libvpx Heap Buffer Overflow Vulnerability