CVE-2024-20399: Cisco NX-OS Command Injection Vulnerability
- Is it exploited?
Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 2 Jul 2024, 1 day after the CVE record was published.
- How likely is exploitation in the next 30 days?
- 4.3%
EPSS score, percentile 91.1 of all scored records
- How severe?
- 6.0 Medium
CVSS v3.1 base score, given by the CNA
- What should I do?
CISA deadline 23 Jul 2024. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
The CVE record links no vendor advisory, patch or mitigation.
- Which versions are affected?
Affected
- 8.2(5)
- 7.3(6)N1(1a)
- 7.3(5)D1(1)
- 8.4(2)
- 7.3(6)N1(1)
- 6.2(2)
and 6 more in the table below
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
What to do
Required action, set by CISA
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CISA due date for this action: 23 July 2024.
Advisories and patches
The CVE record links no vendor advisory, patch or mitigation.
Linked from CISA's catalog entry
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-cmd-injection-xD9OhyOP
- https://nvd.nist.gov/vuln/detail/CVE-2024-20399
Affected products and versions
As listed in the CVE record.
| Status | Versions |
|---|---|
| Affected | 8.2(5) |
| Affected | 7.3(6)N1(1a) |
| Affected | 7.3(5)D1(1) |
| Affected | 8.4(2) |
| Affected | 7.3(6)N1(1) |
| Affected | 6.2(2) |
| Affected | 8.4(3) |
| Affected | 9.2(3) |
| Affected | 7.0(3)I5(2) |
| Affected | 8.2(1) |
| Affected | 6.0(2)A8(7a) |
| Affected | 7.0(3)I4(5) |
Versions not listed are: unknown.
And 306 more version entries in the CVE record.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
About this vulnerability
Cisco NX-OS contains a command injection vulnerability in the command line interface (CLI) that could allow an authenticated, local attacker to execute commands as root on the underlying operating system of an affected device.
Summary: CISA's KEV catalog, as of 28 Oct 2026.
- CISA added CVE-2024-20399 to its Known Exploited Vulnerabilities (KEV) catalog on 2 Jul 2024.
- CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
- The due date CISA sets for the required action is 23 Jul 2024.
- The CVE record was published on 1 Jul 2024, 1 day before it was added to KEV.
- The CVE record carries a CVSS v3.1 base score of 6.0 (Medium), given by its CNA.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 4.3% (percentile 91.1), as of 28 Oct 2026.
- CISA's SSVC assessment in the CVE record: exploitation active, automatable no, technical impact total.
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.
Description
Cisco NX-OS Software CLI Command Injection Vulnerability
A vulnerability in the CLI of Cisco NX-OS Software could allow an authenticated user in possession of Administrator credentials to execute arbitrary commands as root on the underlying operating system of an affected device. This vulnerability is due to insufficient validation of arguments that are passed to specific configuration CLI commands. An attacker could exploit this vulnerability by including crafted input as the argument of an affected configuration CLI command. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system with the privileges of root. Note: To successfully exploit this vulnerability on a Cisco NX-OS device, an attacker must have Administrator credentials. The following Cisco devices already allow administrative users to access the underlying operating system through the bash-shell feature, so, for these devices, this vulnerability does not grant any additional privileges: Nexus 3000 Series Switches Nexus 7000 Series Switches that are running Cisco NX-OS Software releases 8.1(1) and later Nexus 9000 Series Switches in standalone NX-OS mode
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
Weakness
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.
Timeline
| Date | Event |
|---|---|
| 1 Jul 2024 | CVE record published |
| 2 Jul 2024 | Added to CISA KEV |
| 23 Jul 2024 | CISA due date for the required action |
| 21 Oct 2025 | CVE record last updated |
References
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