Junos OS vulnerabilities: known CVEs & security history
Juniper · Actively exploited · 771 tracked CVEs · 7 actively exploited · updated June 2026 · what is a CVE? →
This is the full list of known vulnerabilities (CVEs) across all Junos OS release lines — 771 in total, with 7 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. Showing the top 80 of 771. Open any CVE for full details.
| CVE | Severity | CVSS | EPSS | Year |
|---|---|---|---|---|
| CVE-2023-36845⚡ exploited | critical | 9.8 | 94% | 2023 |
| CVE-2020-1631⚡ exploited | high | 8.8 | 5% | 2020 |
| CVE-2023-36851⚡ exploited | medium | 5.3 | 1% | 2023 |
| CVE-2023-36847⚡ exploited | medium | 5.3 | 85% | 2023 |
| CVE-2023-36846⚡ exploited | medium | 5.3 | 94% | 2023 |
| CVE-2023-36844⚡ exploited | medium | 5.3 | 90% | 2023 |
| CVE-2025-21590⚡ exploited | medium | 4.4 | 2% | 2025 |
| CVE-2021-0248 | critical | 10 | 1% | 2021 |
| CVE-2021-0211 | critical | 10 | 1% | 2021 |
| CVE-2020-1614 | critical | 10 | 1% | 2020 |
| CVE-2017-2343 | critical | 10 | 3% | 2017 |
| CVE-2017-2349 | critical | 9.9 | 2% | 2017 |
| CVE-2024-21591 | critical | 9.8 | 18% | 2024 |
| CVE-2021-0254 | critical | 9.8 | 3% | 2021 |
| CVE-2020-1654 | critical | 9.8 | 2% | 2020 |
| CVE-2020-1647 | critical | 9.8 | 3% | 2020 |
| CVE-2020-1615 | critical | 9.8 | 2% | 2020 |
| CVE-2020-10188 | critical | 9.8 | 75% | 2020 |
| CVE-2019-0036 | critical | 9.8 | 1% | 2019 |
| CVE-2019-0008 | critical | 9.8 | 5% | 2019 |
| CVE-2019-0006 | critical | 9.8 | 5% | 2019 |
| CVE-2019-0002 | critical | 9.8 | 2% | 2019 |
| CVE-2018-0044 | critical | 9.8 | 1% | 2018 |
| CVE-2018-0037 | critical | 9.8 | 4% | 2018 |
| CVE-2018-0016 | critical | 9.8 | 4% | 2018 |
| CVE-2018-0007 | critical | 9.8 | 2% | 2018 |
| CVE-2018-0001 | critical | 9.8 | 6% | 2018 |
| CVE-2017-10615 | critical | 9.8 | 2% | 2017 |
| CVE-2017-2345 | critical | 9.8 | 4% | 2017 |
| CVE-2017-10601 | critical | 9.8 | 2% | 2017 |
| CVE-2016-1279 | critical | 9.8 | 3% | 2016 |
| CVE-2019-0007 | critical | 9.3 | 2% | 2019 |
| CVE-2013-6014 | critical | 9.3 | 1% | 2013 |
| CVE-2019-0040 | critical | 9.1 | 2% | 2019 |
| CVE-2013-4685 | high | 10 | 8% | 2013 |
| CVE-2015-5362 | high | 9.3 | 4% | 2015 |
| CVE-2014-3816 | high | 9 | 2% | 2014 |
| CVE-2013-6618 | high | 9 | 11% | 2013 |
| CVE-2026-33785 | high | 8.8 | 0% | 2026 |
| CVE-2024-39565 | high | 8.8 | 0% | 2024 |
| CVE-2024-21620 | high | 8.8 | 1% | 2024 |
| CVE-2022-22182 | high | 8.8 | 1% | 2022 |
| CVE-2021-31385 | high | 8.8 | 1% | 2021 |
| CVE-2021-31372 | high | 8.8 | 1% | 2021 |
| CVE-2021-0278 | high | 8.8 | 1% | 2021 |
| CVE-2021-0277 | high | 8.8 | 1% | 2021 |
| CVE-2021-0275 | high | 8.8 | 1% | 2021 |
| CVE-2021-0269 | high | 8.8 | 1% | 2021 |
| CVE-2021-0268 | high | 8.8 | 1% | 2021 |
| CVE-2021-0208 | high | 8.8 | 1% | 2021 |
| CVE-2020-1673 | high | 8.8 | 2% | 2020 |
| CVE-2020-1656 | high | 8.8 | 1% | 2020 |
| CVE-2020-1609 | high | 8.8 | 1% | 2020 |
| CVE-2020-1605 | high | 8.8 | 1% | 2020 |
| CVE-2019-0070 | high | 8.8 | 0% | 2019 |
| CVE-2019-0047 | high | 8.8 | 2% | 2019 |
| CVE-2018-0045 | high | 8.8 | 1% | 2018 |
| CVE-2018-0043 | high | 8.8 | 1% | 2018 |
| CVE-2018-0021 | high | 8.8 | 1% | 2018 |
| CVE-2017-2341 | high | 8.8 | 0% | 2017 |
| CVE-2016-1264 | high | 8.8 | 2% | 2016 |
| CVE-2021-0251 | high | 8.6 | 1% | 2021 |
| CVE-2021-0203 | high | 8.6 | 1% | 2021 |
| CVE-2020-1632 | high | 8.6 | 1% | 2020 |
| CVE-2020-1613 | high | 8.6 | 1% | 2020 |
| CVE-2020-1603 | high | 8.6 | 1% | 2020 |
| CVE-2019-0041 | high | 8.6 | 1% | 2019 |
| CVE-2017-10605 | high | 8.6 | 2% | 2017 |
| CVE-2016-1286 | high | 8.6 | 74% | 2016 |
| CVE-2013-6012 | high | 8.5 | 2% | 2013 |
| CVE-2023-44194 | high | 8.4 | 0% | 2023 |
| CVE-2016-4924 | high | 8.4 | 0% | 2017 |
| CVE-2016-4922 | high | 8.4 | 0% | 2017 |
| CVE-2020-1667 | high | 8.3 | 1% | 2020 |
| CVE-2020-1660 | high | 8.3 | 1% | 2020 |
| CVE-2020-1645 | high | 8.3 | 1% | 2020 |
| CVE-2018-0002 | high | 8.2 | 2% | 2018 |
| CVE-2022-22241 | high | 8.1 | 1% | 2022 |
| CVE-2021-0266 | high | 8.1 | 1% | 2021 |
| CVE-2021-0249 | high | 8.1 | 2% | 2021 |
691 older / lower-severity CVEs not shown — see Junos OS's full record.
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 771 CVEs for Junos OS, 7 of which are actively exploited (CISA KEV). 28 are critical-severity and 360 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 — 7 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-2023-36845 (CRITICAL, CVSS 9.8), which is actively exploited, ranks highest — a CWE-473 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.