CVE-2026-7423
Integer Underflow in ICMP Echo Reply Processing in FreeRTOS-Plus-TCP
CVSS Score
5.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-191 |
| Vendor | aws |
| Product | freertos-plus-tcp |
| Published | Apr 29, 2026 |
| Last Updated | Apr 29, 2026 |
Stay Ahead of the Next One
Get instant alerts for aws freertos-plus-tcp
Be the first to know when new medium vulnerabilities affecting aws freertos-plus-tcp are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
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
Affected Versions
AWS / FreeRTOS-Plus-TCP
4.0.0 < 4.2.6 4.3.0 < 4.4.1
References
github.com: https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1 github.com: https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6 aws.amazon.com: https://aws.amazon.com/security/security-bulletins/2026-021-aws/ github.com: https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-7r59-2pgv-9v2r