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Freertos Plus Tcp CVE-2026-7423

| EUVDEUVD-2026-26276 MEDIUM
Integer Underflow (CWE-191)
2026-04-29 AMZN
Buffer Overflow Integer Overflow Denial Of Service Freertos Plus Tcp
6.0
CVSS 4.0 · NVD
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Severity by source

NVD PRIMARY
6.0 MEDIUM
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

4
CVSS changed
Apr 29, 2026 - 19:22 NVD
5.3 (MEDIUM) 6.0 (MEDIUM)
EUVD ID Assigned
Apr 29, 2026 - 19:00 euvd
EUVD-2026-26276
Patch released
Apr 29, 2026 - 19:00 nvd
Patch available
CVE Published
Apr 29, 2026 - 18:36 nvd
MEDIUM 6.0

DescriptionCVE.org

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.

Analysis

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.

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Same weakness CWE-191 – Integer Underflow

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CVE-2026-7423 vulnerability details – vuln.today
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