CVE-2026-7423
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.
- Published Apr 29, 2026
- CVSS 6.0 medium
- 0.4% chance of exploitation in the next 30 days (EPSS)
- A fix is available
Affected software
In the news
- Issue with FreeRTOS-Plus-TCP - MAC Address Validation Bypass and ICMP Echo Reply Integer Underflow AWS Security Bulletins ·