NX-OS vulnerabilities: known CVEs & security history
Cisco · Actively exploited · 275 tracked CVEs · 2 actively exploited · updated June 2026 · what is a CVE? →
This is the full list of known vulnerabilities (CVEs) across all NX-OS release lines — 275 in total, with 2 actively exploited in the wild. A CVE here doesn't mean your version is affected — check NX-OS's current status and the safe version to run.
Known NX-OS CVEs
Actively-exploited and most-severe first. Showing the top 80 of 275. Open any CVE for full details.
| CVE | Severity | CVSS | EPSS | Year |
|---|---|---|---|---|
| CVE-2023-44487⚡ exploited | high | 7.5 | 100% | 2023 |
| CVE-2024-20399⚡ exploited | medium | 6 | 4% | 2024 |
| CVE-2021-1361 | critical | 9.8 | 2% | 2021 |
| CVE-2018-0310 | critical | 9.8 | 4% | 2018 |
| CVE-2018-0301 | critical | 9.8 | 18% | 2018 |
| CVE-2016-1453 | critical | 9.8 | 8% | 2016 |
| CVE-2016-1341 | critical | 9.8 | 1% | 2016 |
| CVE-2015-4235 | high | 9 | 2% | 2015 |
| CVE-2013-1180 | high | 9 | 3% | 2013 |
| CVE-2013-1179 | high | 9 | 3% | 2013 |
| CVE-2022-20650 | high | 8.8 | 14% | 2022 |
| CVE-2021-1368 | high | 8.8 | 0% | 2021 |
| CVE-2020-3415 | high | 8.8 | 1% | 2020 |
| CVE-2020-3217 | high | 8.8 | 1% | 2020 |
| CVE-2020-3172 | high | 8.8 | 2% | 2020 |
| CVE-2020-3119 | high | 8.8 | 5% | 2020 |
| CVE-2019-1901 | high | 8.8 | 1% | 2019 |
| CVE-2019-1614 | high | 8.8 | 4% | 2019 |
| CVE-2018-0395 | high | 8.8 | 1% | 2018 |
| CVE-2018-0313 | high | 8.8 | 4% | 2018 |
| CVE-2018-0303 | high | 8.8 | 1% | 2018 |
| CVE-2018-0330 | high | 8.8 | 3% | 2018 |
| CVE-2018-0293 | high | 8.8 | 5% | 2018 |
| CVE-2018-0292 | high | 8.8 | 2% | 2018 |
| CVE-2016-1302 | high | 8.8 | 2% | 2016 |
| CVE-2024-20321 | high | 8.6 | 1% | 2024 |
| CVE-2024-20267 | high | 8.6 | 1% | 2024 |
| CVE-2022-20624 | high | 8.6 | 12% | 2022 |
| CVE-2022-20623 | high | 8.6 | 12% | 2022 |
| CVE-2021-1588 | high | 8.6 | 1% | 2021 |
| CVE-2021-1587 | high | 8.6 | 2% | 2021 |
| CVE-2021-1586 | high | 8.6 | 2% | 2021 |
| CVE-2021-1523 | high | 8.6 | 1% | 2021 |
| CVE-2021-1387 | high | 8.6 | 1% | 2021 |
| CVE-2021-1230 | high | 8.6 | 1% | 2021 |
| CVE-2020-3517 | high | 8.6 | 1% | 2020 |
| CVE-2020-3398 | high | 8.6 | 2% | 2020 |
| CVE-2020-3397 | high | 8.6 | 2% | 2020 |
| CVE-2020-3228 | high | 8.6 | 2% | 2020 |
| CVE-2020-3175 | high | 8.6 | 2% | 2020 |
| CVE-2019-1964 | high | 8.6 | 2% | 2019 |
| CVE-2019-1962 | high | 8.6 | 2% | 2019 |
| CVE-2019-1858 | high | 8.6 | 3% | 2019 |
| CVE-2019-1616 | high | 8.6 | 2% | 2019 |
| CVE-2019-1599 | high | 8.6 | 14% | 2019 |
| CVE-2019-1598 | high | 8.6 | 3% | 2019 |
| CVE-2019-1597 | high | 8.6 | 3% | 2019 |
| CVE-2018-0378 | high | 8.6 | 4% | 2018 |
| CVE-2017-3883 | high | 8.6 | 4% | 2017 |
| CVE-2013-1178 | high | 8.3 | 1% | 2013 |
| CVE-2020-3165 | high | 8.2 | 1% | 2020 |
| CVE-2021-1227 | high | 8.1 | 1% | 2021 |
| CVE-2019-1590 | high | 8.1 | 1% | 2019 |
| CVE-2015-0721 | high | 8 | 2% | 2016 |
| CVE-2015-0658 | high | 7.9 | 1% | 2015 |
| CVE-2020-3394 | high | 7.8 | 0% | 2020 |
| CVE-2019-12717 | high | 7.8 | 0% | 2019 |
| CVE-2019-1966 | high | 7.8 | 0% | 2019 |
| CVE-2019-1735 | high | 7.8 | 1% | 2019 |
| CVE-2019-1726 | high | 7.8 | 0% | 2019 |
| CVE-2019-1592 | high | 7.8 | 0% | 2019 |
| CVE-2019-1618 | high | 7.8 | 0% | 2019 |
| CVE-2019-1606 | high | 7.8 | 0% | 2019 |
| CVE-2019-1605 | high | 7.8 | 1% | 2019 |
| CVE-2019-1604 | high | 7.8 | 0% | 2019 |
| CVE-2019-1603 | high | 7.8 | 0% | 2019 |
| CVE-2019-1602 | high | 7.8 | 0% | 2019 |
| CVE-2019-1601 | high | 7.8 | 0% | 2019 |
| CVE-2019-1596 | high | 7.8 | 0% | 2019 |
| CVE-2019-1593 | high | 7.8 | 0% | 2019 |
| CVE-2019-1591 | high | 7.8 | 0% | 2019 |
| CVE-2018-0337 | high | 7.8 | 0% | 2018 |
| CVE-2018-0306 | high | 7.8 | 1% | 2018 |
| CVE-2018-0302 | high | 7.8 | 0% | 2018 |
| CVE-2018-0307 | high | 7.8 | 1% | 2018 |
| CVE-2017-6650 | high | 7.8 | 1% | 2017 |
| CVE-2017-6649 | high | 7.8 | 1% | 2017 |
| CVE-2014-2201 | high | 7.8 | 2% | 2014 |
| CVE-2013-1181 | high | 7.8 | 1% | 2013 |
| CVE-2012-2469 | high | 7.8 | 2% | 2012 |
195 older / lower-severity CVEs not shown — see NX-OS's full record.
Is my NX-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 NX-OS version → · Monitor NX-OS for new CVEs →
NX-OS vulnerabilities — frequently asked
How many known vulnerabilities does NX-OS have?
IsItPatched tracks 275 CVEs for NX-OS, 2 of which are actively exploited (CISA KEV). 5 are critical-severity and 114 high-severity. These span every release line — what matters is whether the version you run is affected.
Does NX-OS have any actively-exploited vulnerabilities?
Yes — 2 NX-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 NX-OS vulnerability?
Among tracked issues, CVE-2023-44487 (HIGH, CVSS 7.5), which is actively exploited, ranks highest — a Uncontrolled resource consumption weakness.
Is NX-OS safe to use?
It depends on the version. The latest supported NX-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: NX-OS security status · NX-OS end-of-life · actively-exploited CVEs. Always verify against Cisco's advisories — see our disclaimer.