CVE-2019-1810: Cisco Nexus 3000 Series and 9000 Series Switches in NX-OS Mode CLI Command Software Image Signature Verification Vulnerability

Severity: medium (CVSS 6.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-05-15 · updated 2026-06-17
Weakness: CWE-347

Description

A vulnerability in the Image Signature Verification feature used in an NX-OS CLI command in Cisco Nexus 3000 Series and 9000 Series Switches could allow an authenticated, local attacker with administrator-level credentials to install a malicious software image on an affected device. The vulnerability exists because software digital signatures are not properly verified during CLI command execution. An attacker could exploit this vulnerability to install an unsigned software image on an affected device. Note: If the device has not been patched for the vulnerability previously disclosed in the Cisco Security Advisory cisco-sa-20190306-nxos-sig-verif, a successful exploit could allow the attacker to boot a malicious software image.

Affected products

Cisco NX-OS: from 6.1\(2\)i3\(4\) before 7.0\(3\)i7\(5\); from 7.0\(3\)i7\(5a\) before 9.2\(2\); from 7.0\(3\)i3\(1\) before 7.0\(3\)i7\(1\); from 7.0\(3\)i7\(2\) before 9.2\(1\); from 7.0\(3\)i4\(1\) before 7.0\(3\)i7\(5\); from 7.0\(3\)i4\(2\) before 7.0\(3\)i7\(5\) — fixed in 7.0\(3\)i7\(1\), 7.0\(3\)i7\(5\), 9.2\(1\), 9.2\(2\)

How to fix

Upgrade to a fixed version: Cisco NX-OS 7.0\(3\)i7\(1\), 7.0\(3\)i7\(5\), 9.2\(1\), 9.2\(2\). Check the vendor advisory for mitigations.

References

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