DNS Cache Vulnerability in Amazon FreeRTOS-Plus-TCP
CVE-2026-102552

8.2HIGH

Key Information:

Vendor

Freertos

Status
Freertos-plus-tcp
Vendor
CVE Published:
16 October 2026

What is CVE-2026-102552?

The DNS resolver in Amazon FreeRTOS-Plus-TCP versions before V4.4.2 is susceptible to an issue where the source of communication channels is not properly verified. This vulnerability could permit unauthorized third parties to insert a selected address into the device's DNS cache via forged DNS responses. To address this situation, users are advised to upgrade to version V4.4.2 and activate the ipconfigDNS_CHECK_REPLY_SOURCE_IP option to fortify the security against potential exploits.

Affected Version(s)

FreeRTOS-Plus-TCP 0 <= 4.4.1

References

https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/ta...
release-notespatch
https://aws.amazon.com/security/security-bulletins/2026-1...
vendor-advisory
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/ad...
third-party-advisory

CVSS V4

Score:
8.2
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Causal Security
.