Junos OS vulnerabilities: known CVEs & security history
Juniper · Actively exploited · 50 tracked CVEs · 2 actively exploited · updated November 2026 · what is a CVE? →
This is the full list of known vulnerabilities (CVEs) across all Junos OS release lines — 50 in total, with 2 actively exploited in the wild. A CVE here doesn't mean your version is affected — check Junos OS's current status and the safe version to run.
Known Junos OS CVEs
Actively-exploited and most-severe first. Open any CVE for full details.
| CVE | Severity | CVSS | EPSS | Year |
|---|---|---|---|---|
| CVE-2015-5477⚡ exploited | high | 7.5 | 100% | 2015 |
| CVE-2025-21590⚡ exploited | medium | 4.4 | 2% | 2025 |
| CVE-2026-101990 | critical | 9.8 | 1% | 2026 |
| CVE-2026-101986 | critical | 9.8 | 1% | 2026 |
| CVE-2026-33785 | high | 8.8 | 0% | 2026 |
| CVE-2026-33793 | high | 7.8 | 0% | 2026 |
| CVE-2026-33788 | high | 7.8 | 0% | 2026 |
| CVE-2026-57026 | high | 7.5 | 0% | 2026 |
| CVE-2026-57023 | high | 7.5 | 0% | 2026 |
| CVE-2026-33790 | high | 7.5 | 0% | 2026 |
| CVE-2026-33778 | high | 7.5 | 0% | 2026 |
| CVE-2025-60004 | high | 7.5 | 0% | 2025 |
| CVE-2025-59964 | high | 7.5 | 0% | 2025 |
| CVE-2026-33797 | high | 7.4 | 0% | 2026 |
| CVE-2026-21916 | high | 7.3 | 0% | 2026 |
| CVE-2025-59957 | medium | 6.8 | 0% | 2025 |
| CVE-2026-33791 | medium | 6.7 | 1% | 2026 |
| CVE-2025-30650 | medium | 6.7 | 0% | 2026 |
| CVE-2026-57032 | medium | 6.5 | 0% | 2026 |
| CVE-2026-57027 | medium | 6.5 | 0% | 2026 |
| CVE-2026-57020 | medium | 6.5 | 0% | 2026 |
| CVE-2026-57019 | medium | 6.5 | 0% | 2026 |
| CVE-2026-33801 | medium | 6.5 | 0% | 2026 |
| CVE-2026-33800 | medium | 6.5 | 0% | 2026 |
| CVE-2026-33782 | medium | 6.5 | 0% | 2026 |
| CVE-2026-33781 | medium | 6.5 | 0% | 2026 |
| CVE-2026-33780 | medium | 6.5 | 0% | 2026 |
| CVE-2026-33779 | medium | 6.5 | 0% | 2026 |
| CVE-2026-33775 | medium | 6.5 | 0% | 2026 |
| CVE-2026-33774 | medium | 6.5 | 0% | 2026 |
| CVE-2026-21919 | medium | 6.5 | 0% | 2026 |
| CVE-2025-59980 | medium | 6.5 | 0% | 2025 |
| CVE-2026-57030 | medium | 5.9 | 0% | 2026 |
| CVE-2026-57022 | medium | 5.9 | 0% | 2026 |
| CVE-2025-52960 | medium | 5.9 | 0% | 2025 |
| CVE-2026-57054 | medium | 5.8 | 0% | 2026 |
| CVE-2026-33773 | medium | 5.8 | 0% | 2026 |
| CVE-2026-57025 | medium | 5.5 | 0% | 2026 |
| CVE-2026-33802 | medium | 5.5 | 0% | 2026 |
| CVE-2026-33787 | medium | 5.5 | 0% | 2026 |
| CVE-2026-33786 | medium | 5.5 | 0% | 2026 |
| CVE-2026-33776 | medium | 5.5 | 0% | 2026 |
| CVE-2025-60010 | medium | 5.4 | 0% | 2025 |
| CVE-2026-57024 | medium | 5.3 | 0% | 2026 |
| CVE-2026-57021 | medium | 5.3 | 0% | 2026 |
| CVE-2025-59962 | medium | 5.3 | 0% | 2025 |
| CVE-2004-0230 | medium | 5 | 80% | 2004 |
| CVE-2026-57031 | medium | 4.7 | 0% | 2026 |
| CVE-2026-21901 | medium | 4.4 | 0% | 2026 |
| CVE-2026-33799 | medium | 4.3 | 0% | 2026 |
Is my Junos OS version affected?
The list above spans every release. To know whether your version is affected — and the minimum safe version to upgrade to — check it directly.
Check your Junos OS version → · Monitor Junos OS for new CVEs →
Junos OS vulnerabilities — frequently asked
How many known vulnerabilities does Junos OS have?
IsItPatched tracks 50 CVEs for Junos OS, 2 of which are actively exploited (CISA KEV). 2 are critical-severity and 12 high-severity. These span every release line — what matters is whether the version you run is affected.
Does Junos OS have any actively-exploited vulnerabilities?
Yes — 2 Junos OS CVEs are in CISA's Known Exploited Vulnerabilities catalog, meaning they are confirmed exploited in the wild. Patch these as a priority.
What is the most severe Junos OS vulnerability?
Among tracked issues, CVE-2015-5477 (HIGH, CVSS 7.5), which is actively exploited, ranks highest — a CWE-19 weakness.
Is Junos OS safe to use?
It depends on the version. The latest supported Junos OS release clears the known issues; older versions may still be affected. Check the exact version you run for a verdict.
CVE data aggregated from NVD, CISA KEV and EPSS (FIRST.org). Related: Junos OS security status · Junos OS end-of-life · actively-exploited CVEs. Always verify against Juniper's advisories — see our disclaimer.