CVE-2020-15684: 
NixOS vulnerability analysis and mitigation

CVE-2020-15684 is a high-impact memory safety vulnerability discovered in Firefox 81 and fixed in Firefox 82. The vulnerability was reported by Mozilla developers Christian Holler, Sebastian Hengst, Bogdan Tara, and Tyson Smith (Mozilla Advisory).

The vulnerability involves memory safety bugs that showed evidence of memory corruption. These bugs were present in Firefox 81 and were serious enough to be classified as high impact. According to the security advisory, with sufficient effort, these memory corruption issues could potentially be exploited to execute arbitrary code (Mozilla Advisory).

The vulnerability was rated as high impact due to its potential for memory corruption. Mozilla security researchers indicated that with enough effort, these bugs could have been exploited to run arbitrary code on affected systems, potentially leading to remote code execution (Mozilla Advisory).

While the vulnerability showed evidence of memory corruption and was deemed potentially exploitable, there were no public reports of active exploitation in the wild. However, Mozilla assessed that with sufficient effort, the vulnerability could be weaponized to execute arbitrary code (Mozilla Advisory).

The vulnerability was addressed in Firefox 82. Users were advised to update their Firefox installations to version 82 or later to receive the security fix. After a standard system update, Firefox needed to be restarted to apply all the necessary changes (Ubuntu Notice).