Mozilla Thunderbird ↗
Summary iPlain-English security verdict for Mozilla Thunderbird, generated from its current health score, actively-exploited vulnerabilities, and latest supported version.
Mozilla Thunderbird currently scores 0/100 — critical, with active exploitation. 14 of its known vulnerabilities are being actively exploited in the wild (CISA KEV), including CVE-2023-4863. Upgrade immediately and review your exposure to the actively-exploited CVEs below.
Disclosure trend iNew CVEs published for Mozilla Thunderbird each year (NVD). A higher bar means more disclosures that year — more scrutiny, not necessarily less safe.
1 of its known vulnerability is linked to ransomware campaigns (CISA KEV).
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-2023-4863 HIGH exploited Out-of-bounds write EPSS 100% → fixed in 115.2.2 CVE-2016-9079 HIGH exploited Use-after-free EPSS 88% → fixed in 45.5.1 CVE-2010-3765 CRITICAL exploited Memory corruption EPSS 83% → see advisory CVE-2013-1690 HIGH exploited Memory corruption EPSS 69% → fixed in 17.0.7 CVE-2019-11708 CRITICAL exploited Improper input validation EPSS 56% → fixed in 60.7.2 CVE-2019-17026 HIGH exploited CWE-843 EPSS 47% → fixed in 68.4.1 CVE-2019-11707 HIGH exploited CWE-843 EPSS 38% → fixed in 60.7.2 CVE-2023-5217 HIGH exploited Out-of-bounds write EPSS 34% → fixed in 115.3.1 CVE-2024-9680 CRITICAL exploited ransomware Use-after-free EPSS 33% → fixed in 128.3.1 CVE-2022-26485 HIGH exploited Use-after-free EPSS 14% → fixed in 91.6.2 CVE-2013-1675 MEDIUM exploited CWE-665 EPSS 7% → fixed in 17.0.6 CVE-2020-6820 HIGH exploited CWE-362 EPSS 6% → fixed in 68.7.0See all 1745 known Mozilla Thunderbird CVEs & security history →
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Frequently asked
Is Mozilla Thunderbird safe and patched?
Mozilla Thunderbird currently scores 0/100 — critical, with active exploitation. 14 of its known vulnerabilities are being actively exploited in the wild (CISA KEV), including CVE-2023-4863. Upgrade immediately and review your exposure to the actively-exploited CVEs below.
What should I do about Mozilla Thunderbird now?
Review the patch-priority list, apply the available fixes (or move to the latest release), and confirm against Mozilla's official advisory. Some issues are under active exploitation, so treat this as urgent.
lifecycle unknown — needs latest supported version
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 Thunderbird official site ↗