Thanks for the report. From the advisory, this particular issue only affected Firefox on Windows, so this should be a non-issue on Ubuntu:
"Note: This issue only affected Windows operating systems. Other operating systems are unaffected." ** Information type changed from Private Security to Public Security ** Summary changed: - Mozilla Firefox / Firefox ESR Buffer Overflow Vulnerability + Mozilla Firefox / Firefox ESR Buffer Overflow Vulnerability [MFSA2021-06] ** Changed in: firefox (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to firefox in Ubuntu. https://bugs.launchpad.net/bugs/1915129 Title: Mozilla Firefox / Firefox ESR Buffer Overflow Vulnerability [MFSA2021-06] Status in firefox package in Ubuntu: Invalid Bug description: Description A vulnerability has been reported in Mozilla Firefox and Mozilla Firefox ESR, which can be exploited by malicious people to compromise a vulnerable system. An error within the Angle graphics library can be exploited to cause a buffer overflow and subsequently execute arbitrary code. The vulnerability is reported in Mozilla Firefox versions prior to 85.0.1 and in Mozilla Firefox ESR versions prior to 78.7.1. Affected Software The following software is affected by the described vulnerability. Please check the vendor links below to see if exactly your version is affected. Mozilla Firefox 78.x Mozilla Firefox 85.x Solution Update to a fixed version. Mozilla Firefox: Update to version 85.0.1. Mozilla Firefox ESR: Update to version 78.7.1. References 1. https://www.mozilla.org/en-US/security/advisories/mfsa2021-06 <https://www.mozilla.org/en-US/security/advisories/mfsa2021-06> To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1915129/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp