CVE-2026-102552— Improper verification of the source of a communication channel in FreeRTOS-Plus-TCP DNS resolver
Quick assessment
Affected
FreeRTOS FreeRTOS-Plus-TCP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
在 Amazon FreeRTOS-Plus-TCP V4.4.2 之前版本中，DNS 解析器未能正确验证通信信道的来源。此漏洞可能允许远程第三方通过伪造的 DNS 响应，将指定地址注入设备的 DNS 缓存。 为修复此问题，用户应升级至 V4.4.2 版本，并启用 配置选项。
Affected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| FreeRTOS | FreeRTOS-Plus-TCP | ≤ 4.4.1 |
affected |
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I. Basic Information for CVE-2026-102552
Vulnerability Information
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Vulnerability Title
Improper verification of the source of a communication channel in FreeRTOS-Plus-TCP DNS resolver
Source: CVE Program / CVE List V5
Vulnerability Description
Improper verification of the source of a communication channel in the DNS resolver in Amazon FreeRTOS-Plus-TCP before V4.4.2 might allow remote third-party to insert a chosen address into the device's DNS cache via a forged DNS reply.
To remediate this issue, users should upgrade to version V4.4.2 and enable ipconfigDNS_CHECK_REPLY_SOURCE_IP.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通信信道源的不正确验证
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| FreeRTOS | FreeRTOS-Plus-TCP | 0 ~ 4.4.1 | - |
|
II. Public POCs for CVE-2026-102552
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-102552 (2)
Vendor Pages for CVE-2026-102552 (1)
Same Patch Batch · FreeRTOS · 2026-10-16 · 4 CVEs total
| CVE-2026-109587 | 8.8 HIGH | Incorrect authorization in the Arm Cortex-R82 MPU port in FreeRTOS-Kernel |
| CVE-2026-109588 | 8.8 HIGH | Numeric truncation in the MPU buffer authorization check in FreeRTOS-Kernel |
| CVE-2026-102551 | 7.7 HIGH | Improper verification of the source of a communication channel in FreeRTOS-Plus-TCP Router |
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V. Comments for CVE-2026-102552
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