CVE-2019-11691

Mozilla: Use-after-free in XMLHttpRequest

Severity Score

9.8

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

Puede ocurrir una vulnerabilidad de uso después de liberarse cuando se trabaja con XMLHttpRequest (XHR) en un bucle de eventos, lo que hace que se llame al subproceso principal de XHR después de que se haya liberado. Esto da lugar a una caída potencialmente explotable. Esta vulnerabilidad afecta a Thunderbird inferior a 60.7, Firefox inferior a 67 y Firefox ESR inferior a 60.7 ..

Multiple security issues were discovered in Firefox. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service, spoof the browser UI, trick the user in to launching local executable binaries, obtain sensitive information, conduct cross-site scripting attacks, or execute arbitrary code. Various other issues were also addressed.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-05-03 CVE Reserved
2019-05-21 CVE Published
2024-08-04 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-416: Use After Free

CAPEC

References (5)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://www.mozilla.org/security/advisories/mfsa2019-13	2019-07-26
https://www.mozilla.org/security/advisories/mfsa2019-14	2019-07-26
https://www.mozilla.org/security/advisories/mfsa2019-15	2019-07-26
https://access.redhat.com/security/cve/CVE-2019-11691	2019-06-03
https://bugzilla.redhat.com/show_bug.cgi?id=1712617	2019-06-03

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Mozilla Search vendor "Mozilla"		Firefox Search vendor "Mozilla" for product "Firefox"				< 67.0 Search vendor "Mozilla" for product "Firefox" and version " < 67.0"		-		Affected
Mozilla Search vendor "Mozilla"		Firefox Esr Search vendor "Mozilla" for product "Firefox Esr"				< 60.7 Search vendor "Mozilla" for product "Firefox Esr" and version " < 60.7"		-		Affected
Mozilla Search vendor "Mozilla"		Thunderbird Search vendor "Mozilla" for product "Thunderbird"				< 60.7 Search vendor "Mozilla" for product "Thunderbird" and version " < 60.7"		-		Affected