CVE-2020-6821 Information disclosure in Firefox
An attacker can read sensitive uninitialized memory via WebGL copyTexSubImage in Firefox and Thunderbird, potentially exposing private data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-6821?
CVE-2020-6821 is a high-severity vulnerability in Mozilla Firefox, published on 24 Apr 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
When reading from areas partially or fully outside the source resource with WebGL's <code>copyTexSubImage</code> method, the specification requires the returned values be zero. Previously, this memory was uninitialized, leading to potentially sensitive data disclosure. This vulnerability affects Thunderbird < 68.7.0, Firefox ESR < 68.7, and Firefox < 75.
Weakness: CWE-908
Which versions are affected by CVE-2020-6821?
It affects 3 products.
Products include Mozilla Firefox, Mozilla Firefox Esr, Mozilla Thunderbird.
How do I fix CVE-2020-6821?
Upgrade to a fixed version.
Is CVE-2020-6821 being exploited?
There is no known exploitation of CVE-2020-6821 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox
Sources
Also known as DEBIAN-CVE-2020-6821, GHSA-jj5p-vxx9-rvj7, UBUNTU-CVE-2020-6821.