Mozilla Firefox ↗
Mozilla · Browser
100/100 Healthy
Summary iPlain-English security verdict for Mozilla Firefox, generated from its current health score, actively-exploited vulnerabilities, and latest supported version.
Mozilla Firefox currently scores 100/100 — healthy. 8 actively-exploited vulnerabilities (CISA KEV) affect older releases (e.g. CVE-2010-3765) — staying on the latest supported version keeps you clear of them. The latest supported release is 151.0.4. It's on the latest patch with no significant known issues — keep it current.
Disclosure trend iNew CVEs published for Mozilla Firefox each year (NVD). A higher bar means more disclosures that year — more scrutiny, not necessarily less safe.
'19
'20
'21
'22
'23
'24
'25
'26
Patch priority — what to act on iThe issues to fix first — actively exploited (CISA KEV) first, then by exploitation probability (EPSS), then severity. Each row's "→ fixed in" is the earliest version that patches it; "see advisory" means no fixed version is published.
Most urgent first — actively exploited, then likeliest to be exploited.
CVE-2010-3765 CRITICAL ● exploited Memory corruption EPSS 87% → see advisory CVE-2016-9079 HIGH ● exploited Use-after-free EPSS 85% → fixed in 50.0.2 CVE-2019-11707 HIGH ● exploited CWE-843 EPSS 84% → fixed in 67.0.3 CVE-2015-4495 HIGH ● exploited CWE-346 EPSS 72% → fixed in 39.0.3 CVE-2019-11708 CRITICAL ● exploited Improper input validation EPSS 69% → fixed in 67.0.4 CVE-2019-17026 HIGH ● exploited CWE-843 EPSS 56% → fixed in 72.0.1 CVE-2013-1690 HIGH ● exploited Memory corruption EPSS 47% → fixed in 22.0 CVE-2013-1675 MEDIUM ● exploited CWE-665 EPSS 8% → fixed in 21.0 CVE-2013-2566 MEDIUM CWE-326 EPSS 93% → fixed in 25.0.1 CVE-2015-4000 LOW CWE-310 EPSS 92% → see advisory CVE-2013-0758 HIGH Code injection EPSS 87% → fixed in 18.0 CVE-2016-1960 HIGH EPSS 86% → see advisoryVersions & lifecycle iWhen each release line stops receiving security patches (end-of-life). After EOL there are no more fixes — plan upgrades before these dates.
How long each Mozilla Firefox release line is supported — and when it sunsets.
151 latest 151.0.4 Supported
150 latest 150.0.3 End of life ended 2026-05-18
149 latest 149.0.2 End of life ended 2026-04-21
148 latest 148.0.2 End of life ended 2026-03-24
147 latest 147.0.4 End of life ended 2026-02-24
146 latest 146.0.1 End of life ended 2026-01-13
145 latest 145.0.2 End of life ended 2025-12-09
144 latest 144.0.2 End of life ended 2025-11-11
143 latest 143.0.4 End of life ended 2025-10-14
142 latest 142.0.1 End of life ended 2025-09-16
See all upcoming end-of-life dates →