What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-06-24 · updated 2026-06-17
• Weakness: CWE-126

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.

Affected products

• AWS FreeRTOS-Plus-TCP: from 4.0.0 before 4.1.1 — fixed in 4.1.1

How to fix

Upgrade to a fixed version: AWS FreeRTOS-Plus-TCP 4.1.1. Check the vendor advisory for mitigations.

References

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

Get alerted when CVE-2024-38373 or the next vulnerability affects your stack