| 157736 | Rocky Linux 8 : firefox (RLSA-2021:4123) | Nessus | Rocky Linux Local Security Checks | 2/9/2022 | 11/6/2023 | critical |
| 174073 | NewStart CGSL CORE 5.05 / MAIN 5.05 : firefox Multiple Vulnerabilities (NS-SA-2023-0009) | Nessus | NewStart CGSL Local Security Checks | 4/11/2023 | 4/18/2023 | critical |
| 154969 | CentOS 8 : firefox (CESA-2021:4123) | Nessus | CentOS Local Security Checks | 11/9/2021 | 3/17/2022 | critical |
| 154817 | Mozilla Firefox ESR < 91.3 | Nessus | Windows | 11/2/2021 | 11/18/2025 | critical |
| 154820 | Mozilla Firefox < 94.0 | Nessus | MacOS X Local Security Checks | 11/2/2021 | 11/18/2025 | critical |
| 157643 | AlmaLinux 8 : thunderbird (ALSA-2021:4130) | Nessus | Alma Linux Local Security Checks | 2/9/2022 | 3/17/2022 | critical |
| 154944 | RHEL 8 : thunderbird (RHSA-2021:4130) | Nessus | Red Hat Local Security Checks | 11/6/2021 | 11/7/2024 | critical |
| 154947 | RHEL 8 : thunderbird (RHSA-2021:4132) | Nessus | Red Hat Local Security Checks | 11/6/2021 | 11/7/2024 | critical |
| 247394 | Linux Distros Unpatched Vulnerability : CVE-2021-38504 | Nessus | Misc. | 8/10/2025 | 7/24/2026 | high |
| 206859 | NewStart CGSL MAIN 6.02 : firefox Multiple Vulnerabilities (NS-SA-2024-0066) | Nessus | NewStart CGSL Local Security Checks | 9/10/2024 | 9/25/2025 | critical |
| 154875 | Mozilla Thunderbird < 91.3 | Nessus | Windows | 11/3/2021 | 11/18/2025 | critical |
| 154905 | Oracle Linux 8 : firefox (ELSA-2021-4123) | Nessus | Oracle Linux Local Security Checks | 11/5/2021 | 10/22/2024 | critical |
| 154942 | RHEL 8 : thunderbird (RHSA-2021:4133) | Nessus | Red Hat Local Security Checks | 11/6/2021 | 11/7/2024 | critical |
| 155539 | CentOS 7 : firefox (RHSA-2021:4116) | Nessus | CentOS Local Security Checks | 11/17/2021 | 10/9/2024 | critical |
| 154883 | Ubuntu 18.04 LTS / 20.04 LTS : Firefox vulnerabilities (USN-5131-1) | Nessus | Ubuntu Local Security Checks | 11/3/2021 | 8/28/2024 | critical |
| 154902 | Oracle Linux 7 : thunderbird (ELSA-2021-4134) | Nessus | Oracle Linux Local Security Checks | 11/5/2021 | 10/22/2024 | critical |
| 154934 | Oracle Linux 8 : thunderbird (ELSA-2021-4130) | Nessus | Oracle Linux Local Security Checks | 11/5/2021 | 10/22/2024 | critical |
| 155023 | RHEL 8 : firefox (RHSA-2021:4605) | Nessus | Red Hat Local Security Checks | 11/10/2021 | 11/8/2024 | critical |
| 155575 | SUSE SLED12: MozillaFirefox / MozillaFirefox-devel / etc (SUSE-SU-2021:3721-1) | Nessus | SuSE Local Security Checks | 11/18/2021 | 6/26/2026 | critical |
| 155656 | openSUSE 15 Security Update : MozillaFirefox (openSUSE-SU-2021:3745-1) | Nessus | SuSE Local Security Checks | 11/20/2021 | 3/17/2022 | critical |
| 156385 | Debian DLA-2863-1 : firefox-esr - LTS security update | Nessus | Debian Local Security Checks | 12/29/2021 | 1/24/2025 | critical |
| 156395 | openSUSE 15 Security Update : MozillaThunderbird (openSUSE-SU-2021:1635-1) | Nessus | SuSE Local Security Checks | 12/30/2021 | 3/6/2025 | critical |
| 156961 | Ubuntu 18.04 LTS / 20.04 LTS : Thunderbird vulnerabilities (USN-5248-1) | Nessus | Ubuntu Local Security Checks | 1/22/2022 | 3/6/2025 | critical |
| 163986 | GLSA-202208-14 : Mozilla Thunderbird: Multiple Vulnerabilities | Nessus | Gentoo Local Security Checks | 8/10/2022 | 10/16/2023 | critical |
