CVE-2026-7423 — Integer Underflow in ICMP Echo Reply Processing in FreeRTOS-Plus-TCP
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 c…
Published: 2026-04-29 · CVSS: 6.0 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7