Product / Mozilla
Mozilla Firefox and Thunderbird in CISA KEV
Answer CISA's KEV catalog lists 6 vulnerabilities in Mozilla Firefox and Thunderbird as of catalog 2026.09.23, 46.2% of Mozilla's 13 entries. First added 2021-11-03, latest 2022-05-23; 0 ransomware-linked.
- KEV entries
- 6
- Ransomware: known
- 00%
- First added
- 2021-11-03
- Latest added
- 2022-05-23
- Median days to due
- 101
- Open deadlines
- 0federal
TAdditions by year
| Year | Added |
|---|---|
| 2021 | 3 |
| 2022 | 3 |
| 2023 | 0 |
| 2024 | 0 |
| 2025 | 0 |
| 2026 | 0 |
WWeaknesses
| CWE | Entries | Share |
|---|---|---|
| CWE-843 Type confusion | 2 | 33.3% |
| CWE-362 Race condition | 2 | 33.3% |
| CWE-20 Improper input validation | 1 | 16.7% |
| CWE-119 Memory buffer bounds error | 1 | 16.7% |
| CWE-416 Use after free | 1 | 16.7% |
EAll entries
| CVE | Vulnerability | Added | Due | Ransomware | CWE |
|---|---|---|---|---|---|
| CVE-2019-11708 | Mozilla Firefox and Thunderbird Sandbox Escape Vulnerability | Unknown | CWE-20 | ||
| CVE-2019-11707 | Mozilla Firefox and Thunderbird Type Confusion Vulnerability | Unknown | CWE-843 | ||
| CVE-2013-1690 | Mozilla Firefox and Thunderbird Denial-of-Service Vulnerability | Unknown | CWE-119 | ||
| CVE-2020-6820 | Mozilla Firefox And Thunderbird Use-After-Free Vulnerability | Unknown | CWE-362 | ||
| CVE-2020-6819 | Mozilla Firefox And Thunderbird Use-After-Free Vulnerability | Unknown | CWE-362, CWE-416 | ||
| CVE-2019-17026 | Mozilla Firefox And Thunderbird Type Confusion Vulnerability | Unknown | CWE-843 |
Cite this
CISA's KEV catalog lists 6 vulnerabilities in Mozilla Firefox and Thunderbird. Source: Telemetry analysis of the CISA Known Exploited Vulnerabilities catalog, version 2026.09.23 (released 2026-09-23). https://glide-telemetry.pages.dev/products/mozilla-firefox-and-thunderbird/
Source: CISA KEV catalog v2026.09.23, released 2026-09-23. Windows end 2026-09-23.