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Junos OS

Juniper · Actively exploited
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Monitors Junos OS and tailors your dashboard to that exact version.
all versions0/100 Critical · exploited
⚡ Newly tracked. IsItPatched added Junos OS automatically when CISA flagged it as actively exploited — its data is fresh and being verified.

Summary iPlain-English security verdict for Junos OS, generated from its current health score, actively-exploited vulnerabilities, and latest supported version.

Junos OS currently scores 0/100 — critical, with active exploitation. 7 of its known vulnerabilities are being actively exploited in the wild (CISA KEV), including CVE-2023-36846. Upgrade immediately and review your exposure to the actively-exploited CVEs below.

Disclosure trend iNew CVEs published for Junos OS 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-2023-36846 MEDIUM exploited Missing authentication EPSS 94% → fixed in 20.4 CVE-2023-36845 CRITICAL exploited CWE-473 EPSS 94% → fixed in 20.4 CVE-2023-36844 MEDIUM exploited CWE-473 EPSS 90% → fixed in 20.4 CVE-2023-36847 MEDIUM exploited Missing authentication EPSS 85% → fixed in 20.4 CVE-2020-1631 HIGH exploited Path traversal EPSS 5% → see advisory CVE-2025-21590 MEDIUM exploited CWE-653 EPSS 2% → see advisory CVE-2023-36851 MEDIUM exploited Missing authentication EPSS 1% → see advisory CVE-2019-11358 MEDIUM Prototype pollution EPSS 87% → see advisory CVE-2004-0230 MEDIUM EPSS 81% → fixed in 11.4 CVE-2020-10188 CRITICAL Buffer overflow EPSS 75% → see advisory CVE-2016-1286 HIGH EPSS 74% → see advisory CVE-2016-1285 MEDIUM EPSS 69% → see advisory

See all 771 known Junos OS CVEs & security history →

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Frequently asked

Is Junos OS safe and patched?

Junos OS currently scores 0/100 — critical, with active exploitation. 7 of its known vulnerabilities are being actively exploited in the wild (CISA KEV), including CVE-2023-36846. Upgrade immediately and review your exposure to the actively-exploited CVEs below.

What should I do about Junos OS now?

Review the patch-priority list, apply the available fixes (or move to the latest release), and confirm against Juniper's official advisory. Some issues are under active exploitation, so treat this as urgent.

Why is Junos OS listed on IsItPatched?

Junos OS was added automatically because CISA's Known Exploited Vulnerabilities (KEV) catalog flagged it as actively exploited in the wild. IsItPatched tracks its known CVEs, severity (CVSS), exploitation probability (EPSS) and KEV status from public data; its version and lifecycle mapping is verified over time.

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 Juniper's official advisory before you patch or upgrade.