Cisco IOS ↗
Summary iPlain-English security verdict for Cisco IOS, generated from its current health score, actively-exploited vulnerabilities, and latest supported version.
Cisco IOS currently scores 85/100 — good. 1 actively-exploited vulnerability (CISA KEV) affects older releases (e.g. CVE-2008-4128) — staying on the latest supported version keeps you clear of it. It's largely safe; apply minor updates as they appear. Note: this product is assessed at the product level on recent (365-day) activity rather than an exact per-version match, so it is never marked a confident "healthy".
Disclosure trend iNew CVEs published for Cisco IOS 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-2008-4128 MEDIUM exploited Cross-site request forgery (CSRF) EPSS 12% → see advisoryHow to patch Cisco IOS — step-by-step to the latest secure version →
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Frequently asked
Is Cisco IOS safe and patched?
Cisco IOS currently scores 85/100 — good. 1 actively-exploited vulnerability (CISA KEV) affects older releases (e.g. CVE-2008-4128) — staying on the latest supported version keeps you clear of it. It's largely safe; apply minor updates as they appear. Note: this product is assessed at the product level on recent (365-day) activity rather than an exact per-version match, so it is never marked a confident "healthy".
What should I do about Cisco IOS now?
Review the patch-priority list, apply the available fixes (or move to the latest release), and confirm against Cisco's official advisory. Some issues are under active exploitation, so treat this as urgent.
product-level posture (last 365d); exact per-version verdict pending precise version mapping
Informational only, from public data (NVD · CISA KEV · EPSS · endoflife.date), and can lag or miss vendor-specific fixes. Always confirm against Cisco's official advisory before you patch or upgrade — Cisco IOS official site ↗