CVE-2020-15669 Use after free in Firefox ESR
A use-after-free vulnerability in Firefox ESR and Thunderbird allows attackers to execute arbitrary code when aborting operations.
- 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-2020-15669?
CVE-2020-15669 is a high-severity use after free vulnerability in Mozilla Firefox Esr, published on 1 Oct 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
When aborting an operation, such as a fetch, an abort signal may be deleted while alerting the objects to be notified. This results in a use-after-free and we presume that with enough effort it could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 68.12 and Thunderbird < 68.12.
Weakness: CWE-416
Which versions are affected by CVE-2020-15669?
It affects 2 products.
Products include Mozilla Firefox Esr, Mozilla Thunderbird.
How do I fix CVE-2020-15669?
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-2020-15669 being exploited?
There is no known exploitation of CVE-2020-15669 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox Esr
Sources
Also known as DEBIAN-CVE-2020-15669, GHSA-8vqh-gxqj-vj4q, UBUNTU-CVE-2020-15669.