Mozilla Firefox ↗

Mozilla · Browser

Track your version:Monitors Mozilla Firefox and tailors your dashboard to that exact version.

153.0 · latest cycle100/100 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. No tracked vulnerabilities are currently known to be exploited in the wild. The latest supported release is 153.0. 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.

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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-2026-4698 CRITICAL CWE-843 EPSS 1% → fixed in 149.0 CVE-2026-4689 CRITICAL Integer overflow EPSS 1% → fixed in 149.0 CVE-2026-2796 CRITICAL CWE-843 EPSS 1% → fixed in 148.0 CVE-2026-2773 CRITICAL Memory corruption EPSS 1% → fixed in 148.0 CVE-2026-2775 CRITICAL CWE-288 EPSS 1% → fixed in 148.0 CVE-2026-2762 CRITICAL Integer overflow EPSS 1% → fixed in 148.0 CVE-2026-2774 CRITICAL Integer overflow EPSS 1% → fixed in 148.0 CVE-2026-4688 CRITICAL Use-after-free EPSS 1% → fixed in 149.0 CVE-2026-0879 CRITICAL Memory corruption EPSS 1% → fixed in 147.0 CVE-2026-2757 CRITICAL CWE-1384 EPSS 0% → fixed in 148.0 CVE-2026-4692 CRITICAL CWE-653 EPSS 0% → fixed in 149.0 CVE-2026-2771 CRITICAL Out-of-bounds read EPSS 0% → fixed in 148.0

See all 207 known Mozilla Firefox CVEs & security history →

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Versions & 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. Select a line for its full report.

Mar31'27 Mozilla Firefox 115EOL 2027-03-31

Sept29'26 Mozilla Firefox 140EOL 2026-09-29

Jul21'26 Mozilla Firefox 152ended 2026-07-21

Jun16'26 Mozilla Firefox 151ended 2026-06-16

May18'26 Mozilla Firefox 150ended 2026-05-18

Apr21'26 Mozilla Firefox 149ended 2026-04-21

Mar24'26 Mozilla Firefox 148ended 2026-03-24

Feb24'26 Mozilla Firefox 147ended 2026-02-24

Jan13'26 Mozilla Firefox 146ended 2026-01-13

Dec9'25 Mozilla Firefox 145ended 2025-12-09

Nov11'25 Mozilla Firefox 144ended 2025-11-11

Oct14'25 Mozilla Firefox 143ended 2025-10-14

Full Mozilla Firefox end-of-life dates & support timeline →

Frequently asked

Is Mozilla Firefox safe and patched?

What should I do about Mozilla Firefox now?

Upgrade Mozilla Firefox to the latest supported release (153.0) or later and apply available security updates, then confirm against Mozilla's official advisory.

When does Mozilla Firefox reach end-of-life?

The latest supported Mozilla Firefox release is 153.0. After end-of-life a release no longer receives security patches.

Which versions of Mozilla Firefox are still receiving security updates?

Supported Mozilla Firefox release lines (latest 153.0): 153, 140, 115. End-of-life releases no longer receive security patches.

Informational only, from public data (NVD · CISA KEV · EPSS · endoflife.date), and can lag or miss vendor-specific fixes. Always confirm against Mozilla's official advisory before you patch or upgrade — Mozilla Firefox official site ↗