CVE-2019-11756 Use after free in Firefox
Improper refcounting in Firefox soft token sessions allows attackers to trigger a use-after-free, causing a browser crash and denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2019-11756?
CVE-2019-11756 is a high-severity use after free vulnerability in Mozilla Firefox, published on 8 Jan 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Improper refcounting of soft token session objects could cause a use-after-free and crash (likely limited to a denial of service). This vulnerability affects Firefox < 71.
Weakness: CWE-416
Which versions are affected by CVE-2019-11756?
It affects 1 product.
Products include Mozilla Firefox.
How do I fix CVE-2019-11756?
Upgrade to a fixed version.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2019-11756 being exploited?
There is no known exploitation of CVE-2019-11756 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox
Sources
Also known as GHSA-v78f-65qq-96m8, UBUNTU-CVE-2019-11756.