# CVE-2024-20399 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 - Page: https://www.vulneraibility.com/cve/CVE-2024-20399 - CVSS: 6.0 - Known exploited: yes, in CISA KEV since 2024-07-02; CISA due date 2024-07-23 - EPSS: 4.31% (percentile 91.3) - Unvetted proof-of-concept code on GitHub: 1 GitHub proof of concept (first 2026-06-17) - CISA SSVC: exploitation active, automatable no, technical impact total (assessed 2024-07-02) - Weakness: CWE-78 - Published: 2024-07-01 ## Affected versions - Cisco Cisco NX-OS Software: 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); 8.4(3); 9.2(3); 7.0(3)I5(2); 8.2(1); 6.0(2)A8(7a); 7.0(3)I4(5); 6.0(2)A6(1); 7.3(1)D1(1); 6.2(14a); 7.0(3)I4(6); 7.3(4)N1(1); 7.0(3)I4(3); 9.2(2v); 6.0(2)A6(5b); 7.3(0)D1(1); 6.2(17a); 7.0(3)I4(7); 6.0(2)U6(1a); 7.1(5)N1(1b); 7.0(3)I4(1); 7.0(3)I4(8); 7.0(3)I4(2); 7.1(4)N1(1c); 7.0(3)IM3(1); 6.0(2)U6(5a); 6.0(2)A8(11); 6.0(2)A6(4a); 6.2(9); 6.2(5); 7.3(4)D1(1); 6.2(20); 9.2(1); 9.2(2t); 9.2(3y); 7.0(3)I4(1t); 6.0(2)U6(5c); 6.0(2)A6(4); 7.0(3)I7(6z); 9.3(2); 7.3(1)DY(1); 7.0(3)F3(3); 6.0(2)U6(6); 6.2(29); 7.0(3)I7(3z); 7.0(3)IM7(2); 6.0(2)A8(11b); 6.2(9a); 7.3(0)N1(1); 7.0(3)I7(5a); 6.2(11d); 8.1(1); 7.0(3)I6(1); 6.0(2)U6(10); 7.2(2)D1(2); 7.0(3)IM3(2); 6.0(2)A6(8); 8.2(2); 6.0(2)U6(1); 7.3(2)N1(1c); 7.0(3)I5(3b); 8.3(2); 7.3(5)N1(1); 6.0(2)A6(2a); 7.3(2)N1(1b); 6.2(27); 7.3(2)D1(3a); 7.3(1)N1(1); 6.0(2)U6(7); 9.2(4); 7.1(4)N1(1a); 7.1(3)N1(4); 7.0(3)IM3(2a); 6.2(8b); 6.0(2)A8(10); 7.1(3)N1(2); 6.2(13); 6.0(2)A8(2); 7.0(3)IC4(4); 6.2(1); 7.3(4)N1(1a); 8.1(2); 6.0(2)A6(3); 6.0(2)U6(5b); 7.0(3)F3(3c); 7.3(3)D1(1); 7.0(3)F3(1); 6.0(2)U6(5); 7.0(3)F3(5); 7.1(2)N1(1); 7.1(3)N1(3); 8.2(3); 6.0(2)A6(7); 7.0(3)I7(2); 6.2(5a); 6.2(18); 6.0(2)A6(5); 7.0(3)IM3(2b); 7.1(3)N1(1); 6.0(2)U6(4a); 7.0(3)I5(3); 7.0(3)I7(3); 6.0(2)A8(6); 7.0(3)I6(2); 8.3(1); 6.2(3); 6.2(22); 7.1(1)N1(1); 8.4(1); 8.1(1b); 7.3(0)N1(1b); 7.2(2)D1(4); 6.0(2)A8(5); 7.3(0)DX(1); 7.1(4)N1(1d); 7.3(2)D1(1); 7.3(2)N1(1); 6.0(2)U6(8); 7.1(1)N1(1a); 7.0(3)IM3(3); 9.3(1); 6.0(2)U6(2); 6.2(9b); 7.1(3)N1(2a); 7.3(0)N1(1a); 6.0(2)A8(7); 7.0(3)I7(6); 7.3(2)D1(2); 6.2(25); 6.0(2)U6(3a); 8.0(1); 6.0(2)A8(11a); 6.2(11e); 7.1(3)N1(5); 7.0(3)I4(8z); 6.2(11); 7.0(3)I4(9); 6.2(16); 6.2(19); 8.2(4); 6.2(2a); 7.2(2)D1(3); 7.1(0)N1(1b); 7.0(3)I7(4); 7.0(3)I7(7); 6.2(5b); 7.3(0)DY(1); 6.0(2)A8(9); 6.0(2)A8(1); 7.1(5)N1(1); 7.2(1)D1(1); 6.2(15); 6.0(2)A6(6); 6.0(2)A8(10a); 7.0(3)I5(1); 9.3(1z); 9.2(2); 6.2(7); 6.2(9c); 7.0(3)F3(4); 7.3(3)N1(1); 6.2(6b); 7.0(3)I4(8b); 8.1(2a); 7.3(2)D1(3); 6.2(8); 6.0(2)A8(3); 6.2(11b); 7.0(3)I4(6t); 7.0(3)I5(3a); 8.1(1a); 6.2(13a); 6.0(2)A8(8); 7.0(3)I7(5); 7.0(3)F3(3a); 7.1(0)N1(1a); 6.0(2)A8(4); 6.0(2)A6(3a); 6.0(2)A6(5a); 7.0(3)F2(1); 7.0(3)I4(8a); 6.0(2)U6(9); 7.0(3)F3(2); 6.0(2)U6(2a); 6.2(12); 6.2(17); 7.0(3)I4(4); 6.2(23); 6.2(13b); 6.0(2)U6(3); 6.2(10); 6.2(6a); 6.2(6); 7.1(2)N1(1a); 6.2(14); 7.0(3)I7(1); 6.2(14b); 6.2(21); 7.2(2)D1(1); 7.0(3)F2(2); 7.0(3)IA7(2); 7.0(3)IA7(1); 6.0(2)A8(7b); 6.2(8a); 6.2(11c); 7.0(3)F1(1); 6.0(2)A6(1a); 7.1(0)N1(1); 7.2(0)D1(1); 6.0(2)A6(2); 7.1(4)N1(1); 6.0(2)A8(4a); 6.2(20a); 6.0(2)U6(4); 8.4(1a); 9.3(3); 7.3(2)D1(1d); 7.3(7)N1(1); 6.2(24); 6.2(31); 7.0(3)I7(8); 6.0(2)U6(10a); 7.3(7)N1(1a); 9.3(4); 7.3(6)D1(1); 6.2(26); 8.2(6); 6.2(33); 9.3(5); 8.4(2a); 8.4(2b); 7.3(8)N1(1); 7.0(3)I7(9); 7.3(7)N1(1b); 6.2(24a); 8.5(1); 9.3(6); 10.1(2); 10.1(1); 8.4(4); 7.3(7)D1(1); 8.4(2c); 9.3(5w); 8.2(7); 7.3(9)N1(1); 9.3(7); 9.3(7k); 7.0(3)I7(9w); 10.2(1); 7.3(8)N1(1a); 7.3(8)D1(1); 9.3(7a); 8.2(7a); 9.3(8); 8.4(4a); 8.4(2d); 7.3(10)N1(1); 8.4(5); 7.0(3)I7(10); 7.3(8)N1(1b); 8.2(8); 10.2(1q); 10.2(2); 9.3(9); 7.3(9)D1(1); 7.3(11)N1(1); 10.2(3); 8.4(6); 8.4(2e); 9.3(10); 7.3(11)N1(1a); 10.2(2a); 7.3(12)N1(1); 9.2(1a); 8.2(9); 10.3(1); 10.2(4); 7.3(13)N1(1); 8.4(7); 10.3(2); 8.4(6a); 9.3(11); 10.3(3); 10.2(5); 9.4(1); 9.3(2a); 8.4(2f); 8.2(10); 9.3(12); 10.4(1); 8.4(8); 10.3(99w); 7.3(14)N1(1); 10.2(6); 10.3(3w); 10.3(99x); 10.3(3o); 8.4(9); 10.3(4); 10.3(3p); 10.3(4a); 9.4(1a); 10.4(2); 10.3(3q); 9.3(13); 8.2(11); 9.4(2); 10.3(5); 10.2(7); 10.3(3x); 10.3(4g); 10.2(8); 10.3(3r) A version outside these ranges is not a statement that it is unaffected. ## References - [other] https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-cmd-injection-xD9OhyOP - [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-20399 - [other] https://www.sygnia.co/threat-reports-and-advisories/china-nexus-threat-group-velvet-ant-exploits-cisco-0-day/ --- Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.