CVE-2026-7424
Integer Underflow in DHCPv6 Sub-Option Parser in FreeRTOS-Plus-TCP
CVSS Score
8.1
EPSS Score
0.0%
EPSS Percentile
0th
Integer underflow in the DHCPv6 sub-option parser in FreeRTOS-Plus-TCP before V4.4.1 and V4.2.6 allows an adjacent network actor to corrupt the device's IPv6 address assignment, DNS configuration, and lease times, and to cause a denial of service (permanent IP task freeze requiring hardware reset) by sending a single crafted DHCPv6 packet. The issue is present whenever DHCPv6 is enabled. To mitigate this issue, users should upgrade to version V4.2.6 or V4.4.1 or newer.
| 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 high 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:L/PR:N/UI:N/S:U/C:N/I:H/A:H Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High
Affected Versions
AWS / FreeRTOS-Plus-TCP
4.0.0 < 4.2.6 4.3.0 < 4.4.1