Summary iPlain-English security verdict for PuTTY, generated from its current health score, actively-exploited vulnerabilities, and latest supported version.
PuTTY currently scores 0/100 — critical. No tracked vulnerabilities are currently known to be exploited in the wild. Upgrade promptly to address the open critical vulnerabilities.
Disclosure trend iNew CVEs published for PuTTY each year (NVD). A higher bar means more disclosures that year — more scrutiny, not necessarily less safe.
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-2023-48795 MEDIUM CWE-354 EPSS 93% → fixed in 0.80 CVE-2002-1359 HIGH Improper input validation EPSS 80% → see advisory CVE-2017-6542 CRITICAL Memory corruption EPSS 22% → see advisory CVE-2019-9898 CRITICAL CWE-330 EPSS 4% → fixed in 0.71 CVE-2019-9895 CRITICAL Memory corruption EPSS 3% → fixed in 0.71 CVE-2019-17067 CRITICAL Resource exhaustion EPSS 2% → fixed in 0.73Get alerted about PuTTY
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Frequently asked
Is PuTTY safe and patched?
PuTTY currently scores 0/100 — critical. No tracked vulnerabilities are currently known to be exploited in the wild. Upgrade promptly to address the open critical vulnerabilities.
What should I do about PuTTY now?
Review the patch-priority list, apply the available fixes (or move to the latest release), and confirm against PuTTY's official advisory.
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 PuTTY's official advisory before you patch or upgrade — PuTTY official site ↗