| 155552 | CentOS 7 : thunderbird (RHSA-2021:3841) | Nessus | CentOS Local Security Checks | 11/17/2021 | 10/9/2024 | critical |
| 153881 | Mozilla Firefox < 93.0 | Nessus | Windows | 10/5/2021 | 12/18/2025 | critical |
| 154003 | SUSE SLES15: MozillaFirefox / MozillaFirefox-branding-SLE / MozillaFirefox-devel / etc (SUSE-SU-2021:3331-1) | Nessus | SuSE Local Security Checks | 10/12/2021 | 6/25/2026 | critical |
| 154011 | openSUSE 15 Security Update : MozillaFirefox (openSUSE-SU-2021:3331-1) | Nessus | SuSE Local Security Checks | 10/12/2021 | 3/6/2025 | critical |
| 154022 | RHEL 8 : firefox (RHSA-2021:3755) | Nessus | Red Hat Local Security Checks | 10/12/2021 | 11/7/2024 | critical |
| 154024 | RHEL 8 : firefox (RHSA-2021:3757) | Nessus | Red Hat Local Security Checks | 10/12/2021 | 11/7/2024 | critical |
| 154077 | RHEL 7 : firefox (RHSA-2021:3791) | Nessus | Red Hat Local Security Checks | 10/13/2021 | 11/7/2024 | critical |
| 154143 | RHEL 8 : thunderbird (RHSA-2021:3840) | Nessus | Red Hat Local Security Checks | 10/14/2021 | 11/7/2024 | critical |
| 154158 | CentOS 8 : thunderbird (CESA-2021:3838) | Nessus | CentOS Local Security Checks | 10/15/2021 | 5/9/2022 | critical |
| 154182 | SUSE SLED15: MozillaFirefox / MozillaFirefox-branding-SLE / MozillaFirefox-devel / etc (SUSE-SU-2021:3451-1) | Nessus | SuSE Local Security Checks | 10/17/2021 | 6/25/2026 | critical |
| 154353 | Oracle Linux 7 : thunderbird (ELSA-2021-3841) | Nessus | Oracle Linux Local Security Checks | 10/23/2021 | 10/22/2024 | 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 |
| 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 |
| 153925 | Ubuntu 18.04 LTS / 20.04 LTS : Firefox vulnerabilities (USN-5107-1) | Nessus | Ubuntu Local Security Checks | 10/7/2021 | 8/27/2024 | critical |
| 154058 | Mozilla Thunderbird < 91.2 | Nessus | MacOS X Local Security Checks | 10/13/2021 | 11/18/2025 | critical |
| 154135 | RHEL 8 : thunderbird (RHSA-2021:3838) | Nessus | Red Hat Local Security Checks | 10/14/2021 | 11/7/2024 | critical |
| 154193 | openSUSE 15 Security Update : MozillaFirefox (openSUSE-SU-2021:3451-1) | Nessus | SuSE Local Security Checks | 10/17/2021 | 3/6/2025 | critical |
| 154341 | Oracle Linux 7 : firefox (ELSA-2021-3791) | Nessus | Oracle Linux Local Security Checks | 10/22/2021 | 10/22/2024 | critical |
| 155551 | CentOS 7 : firefox (RHSA-2021:3791) | Nessus | CentOS Local Security Checks | 11/17/2021 | 10/9/2024 | critical |
| 245913 | Linux Distros Unpatched Vulnerability : CVE-2021-38501 | Nessus | Misc. | 8/8/2025 | 7/24/2026 | high |
| 153878 | Mozilla Firefox ESR < 91.2 | Nessus | Windows | 10/5/2021 | 11/18/2025 | critical |
| 294640 | MiracleLinux 8 : thunderbird-91.2.0-1.el8.ML.1 (AXSA:2021-2482:19) | Nessus | Miracle Linux Local Security Checks | 1/20/2026 | 1/20/2026 | critical |
| 359019 | Rocky Linux 8 [CIQ] Security Update: thunderbird / thunderbird-debuginfo / thunderbird-debugsource Multiple Vulnerabilities (crlsa-2021_3838) | Nessus | Rocky Linux Local Security Checks | 10/1/2026 | 10/1/2026 | critical |
