CVE-2019-1809

Cisco NX-OS Software Patch Signature Verification Bypass Vulnerability

MEDIUM

6.7

CVSS Score

Published: May 15, 2019 at 10:15 PM UTC

Updated: June 17, 2026 at 02:29 AM UTC

37 products affected across 1 vendorNx OSUcs 6296UpUcs 6248Up

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Severity

MEDIUM6.7

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

Description

A vulnerability in the Image Signature Verification feature of Cisco NX-OS Software could allow an authenticated, local attacker with administrator-level credentials to install a malicious software patch on an affected device. The vulnerability is due to improper verification of digital signatures for patch images. An attacker could exploit this vulnerability by crafting an unsigned software patch to bypass signature checks and loading it on an affected device. A successful exploit could allow the attacker to boot a malicious software patch image.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Nx OS · Cisconpm

95%

v < 8.3(1)3.1 ≤ v < 3.2(3k)7.2 ≤ v < 7.3(3)d1(1)7.3 ≤ v < 8.1(1a)8.0 ≤ v < 8.2(3)8.2 ≤ v < 8.3(1)

Affected range stops below 3.2(3k), so it looks safe — our inference, not a vendor statement

Affected range stops below 7.3(3)d1(1), so it looks safe — our inference, not a vendor statement

Affected range stops below 8.1(1a), so it looks safe — our inference, not a vendor statement

Affected range stops below 8.2(3), so it looks safe — our inference, not a vendor statement

Affected range stops below 8.3(1), so it looks safe — our inference, not a vendor statement

cisco-7000-10-slot (environment) · cisco-7000-18-slot (environment) · cisco-7000-4-slot (environment) · cisco-7000-9-slot (environment) · cisco-7700-10-slot (environment) · cisco-7700-18-slot (environment) · cisco-7700-2-slot (environment) · cisco-7700-6-slot (environment) · cisco-mds-9706 (environment) · cisco-mds-9710 (environment) · cisco-mds-9718 (environment) · cisco-n77-f312ck-26 (environment) · cisco-n77-f324fq-25 (environment) · cisco-n77-f348xp-23 (environment) · cisco-n77-f430cq-36 (environment) · cisco-n77-m312cq-26l (environment) · cisco-n77-m324fq-25l (environment) · cisco-n77-m348xp-23l (environment) · cisco-n7k-f248xp-25e (environment) · cisco-n7k-f306ck-25 (environment) · cisco-n7k-f312fq-25 (environment) · cisco-n7k-m202cf-22l (environment) · cisco-n7k-m206fq-23l (environment) · cisco-n7k-m224xp-23l (environment) · cisco-n7k-m324fq-25l (environment) · cisco-n7k-m348xp-25l (environment) · cisco-nexus-7000-supervisor-1 (environment) · cisco-nexus-7000-supervisor-2 (environment) · cisco-nexus-7000-supervisor-2e (environment) · cisco-nexus-7700-supervisor-2e (environment) · cisco-nexus-7700-supervisor-3e (environment) · cisco-ucs-6248up (environment) · cisco-ucs-6296up (environment) · cisco-ucs-6324 (environment) · cisco-ucs-6332 (environment) · cisco-ucs-6332-16up (environment)

7000 10-Slot · Ciscodevice

80%

All versions

7000 18-Slot · Ciscodevice

80%

All versions

7000 4-Slot · Ciscodevice

80%

All versions

7000 9-Slot · Ciscodevice

80%

All versions