CVE-2026-7423

MEDIUM EPSS 12.6%
Published Apr 29, 20262mo ago · Modified Jun 17, 20262w ago
6.0 CVSS 4.0
Medium
Find Similar
Published Apr 29, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
6.0
Exploitability
—
Impact
—
Vector string
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

Threat Intelligence

EPSS Exploit Probability
12.6% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-191

Affected Products 2

VendorProductVersionRange
amazonfreertos-plus-tcp*≥4.0.0  –  <4.2.6
amazonfreertos-plus-tcp*≥4.3.0  –  <4.4.1

References 4

  • aws.amazon.com https://aws.amazon.com/security/security-bulletins/2026-021-aws/
    Vendor Advisory
  • github.com https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6
    Release Notes
  • github.com https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1
    Release Notes
  • github.com https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-7r59-2pgv-9v2r
    PatchVendor Advisory

Remediation

  • github.com https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-7r59-2pgv-9v2r
    PatchVendor Advisory