Medium severity · published Oct 16, 2026
CVE-2026-102552
Improper verification of the source of a communication channel in FreeRTOS-Plus-TCP DNS resolver
5.9
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 14% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FR
FreeRTOS-Plus-TCP · FreeRTOS
through 4.4.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-102552
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-102552
aws.amazon.com
https://aws.amazon.com/security/security-bulletins/2026-139-aws/
github.com
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.2
github.com
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-h4fw-pv82-p7h5
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