CVE-2019-1731: Cisco NX-OS

Medium severity, CVSS 4.4. EPSS: 0.4% chance of exploitation in the next 30 days.

A vulnerability in the SSH CLI key management functionality of Cisco NX-OS Software could allow an authenticated, local attacker to expose a user's private SSH key to all authenticated users on the targeted device. The attacker must authenticate with valid administrator device credentials. The vulnerability is due to incomplete error handling if a specific error type occurs during the SSH key export. An attacker could exploit this vulnerability by authenticating to the device and entering a crafted command at the CLI. A successful exploit could allow the attacker to expose a user's private SSH key. In addition, a similar type of error in the SSH key import could cause the passphrase-protected private SSH key to be imported unintentionally.

Affected products

• Cisco NX-OS: before 7.0\(3\)i4\(9\) (fixed in 7.0\(3\)i4\(9\)); from 7.0\(3\)i7, before 7.0\(3\)i7\(4\) (fixed in 7.0\(3\)i7\(4\)); before 6.0\(2\)a8\(10\) (fixed in 6.0\(2\)a8\(10\)); from 7.0\(3\)i4, before 7.0\(3\)i7\(4\) (fixed in 7.0\(3\)i7\(4\)); before 7.3\(4\)n1\(1\) (fixed in 7.3\(4\)n1\(1\)); from 7.0\(3\), before 7.0\(3\)f3\(5\) (fixed in 7.0\(3\)f3\(5\))

Published 2019-05-15. Last modified 2026-06-17.