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TI-2026-75385 Aliases CVE-2026-102552

Forged DNS replies can poison the FreeRTOS-Plus-TCP DNS cache

Priority LOW 35CWE-940Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · High · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

FreeRTOS-Plus-TCP through 4.4.1 is affected in its DNS resolver, which does not verify the source of DNS replies (CWE-940). A remote third party can send a forged DNS reply to insert a chosen address into the device's DNS cache.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00233 14th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
FreeRTOSFreeRTOS-Plus-TCPup to 4.4.1—No fix listedCNA
  • FreeRTOS-Plus-TCP VendorFreeRTOS Affected up to 4.4.1 Fixed in — No fix listed CNA

Remediation

Upgrade FreeRTOS-Plus-TCP to V4.4.2 and enable ipconfigDNS_CHECK_REPLY_SOURCE_IP, as the source description advises.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    FreeRTOS-Plus-TCP — aws.amazon.com/security/security-bulletins/2026-139-aws

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-75384 FreeRTOS-Plus-TCP IPv6 Router Advertisement source verification flawPriority MEDIUM 41
    Show all 2 records → Advisory →

Timeline

  1. 2026-10-16 Threatist record created from CVE-2026-102552
  2. 2026-10-18 Priority changed: MEDIUM → LOW
  3. 2026-10-19 CISA SSVC decision points changed

References

Patch 1

Advisory 2

  • TI-2026-07633 DoS from MQTT v5.0 Deserialization Fault in core MQTT CVSS 4.0HIGH 8.7
  • TI-2024-25630 FreeRTOS-Plus-TCP Buffer Over-Read in DNS Response Parser CVSS 3.1CRITICAL 9.6
  • TI-2026-75384 FreeRTOS-Plus-TCP IPv6 Router Advertisement source verification flaw CVSS 4.0CRITICAL 9.2
  • TI-2026-75383 Numeric truncation in FreeRTOS-Kernel lets tasks access kernel memory CVSS 4.0CRITICAL 9.3
  • TI-2026-75382 Incorrect authorization in FreeRTOS-Kernel Cortex-R82 MPU port CVSS 4.0CRITICAL 9.3
  • TI-2026-53921 Improper input validation in FreeRTOS-Kernel timer command handling CVSS 4.0CRITICAL 9.3
See all 11 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences