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CVE-2026-7423

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CVE-2026-7423

Published: Apr 29, 2026

Modified: Apr 29, 2026

PUBLISHED

CVSS v3.1

5.3

MEDIUM

Description

Integer underflow in the ICMP and ICMPv6 echo reply handlers in FreeRTOS-Plus-TCP before V4.4.1 and V4.2.6 allows an adjacent network user to cause a denial of service (device crash) when outgoing ping support is enabled, because header sizes are subtracted from a packet length field without validating the field is large enough, resulting in a heap out-of-bounds read of up to approximately 65KB. To mitigate this issue, users should upgrade to the fixed version when available.

VendorProductVersions

AWS

FreeRTOS-Plus-TCP

affected
4.0.0 - < 4.2.6
affected
4.3.0 - < 4.4.1
unaffected
4.2.6
unaffected
4.4.1

Weaknesses (CWE)

CWE-191

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Adjacent

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

References

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