CVE-2019-11756: Use After Free
A use-after-free flaw was found in Mozilla Network Security Services (NSS) related to PK11 session handling. An attacker could use this flaw to execute arbitrary code with the permissions of the user running the application compiled with NSS.
Other sources
A use-after-free was found in Mozilla nss, related to PK11 session handling. An attacker could this to execute arbitrary code with the permissions of user running the application (compiled with nss). This flaw is difficult to trigger (even impossible as per upstream)
— Red Hat
Improper refcounting of soft token session objects could cause a use-after-free and crash (likely limited to a denial of service).
Mozilla Firefox could allow a remote attacker to execute arbitrary code on the system, caused by a use-after-free of SFTKSession object. By persuading a victim to visit a specially-crafted Web site, a remote attacker could exploit this vulnerability using unknown attack vectors to execute arbitrary code on the vulnerable system or cause a denial of service.
— IBM
Affected Software
Event History
Parent advisories
This vulnerability appears in the following advisories.
Peer vulnerabilities
Found alongside the following vulnerabilities.
Frequently Asked Questions
What is CVE-2019-11756?
CVE-2019-11756 is a vulnerability in Mozilla Firefox that could allow a remote attacker to execute arbitrary code on the system.
What is the severity of CVE-2019-11756?
The severity of CVE-2019-11756 is high, with a CVSS score of 8.8.
How does CVE-2019-11756 occur?
CVE-2019-11756 occurs due to improper refcounting of soft token session objects, leading to a use-after-free vulnerability.
How can an attacker exploit CVE-2019-11756?
An attacker can exploit CVE-2019-11756 by persuading a victim to visit a specially-crafted website.
How can I protect myself from CVE-2019-11756?
To protect yourself from CVE-2019-11756, ensure that you have applied the necessary security updates provided by Mozilla Firefox or your operating system vendor.