CVE-2026-7424 - Integer Underflow in DHCPv6 Sub-Option Parser in FreeRTOS-Plus-TCP
Bulletin ID: 2026-022-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 2026/04/29 12:20 PM PDT Description: FreeRTOS-Plus-TCP is an open-source, scalable TCP/IP stack for FreeRTOS. We identified CVE-2026-7424, where an integer underflow issue in the DHCPv6 sub-option parser could allow an adjacent network user to corrupt the device's IPv6 address assignment, DNS configuration, and lease times, and to cause a denial of service (IP task freeze requiring hardware reset). Impacted versions: FreeRTOS-Plus-TCP >=V4.0.0 AND <=V4.2.5, >=V4.3.0 AND <= V4.4.0 Please refer to the article below for the most up-to-date and complete information related to this AWS Security Bulletin.
CSIRTS triage
- What
- An integer underflow in the DHCPv6 sub-option parser could allow an adjacent network user to corrupt device configurations and cause a denial of service.
- Who is affected
- Devices using FreeRTOS-Plus-TCP versions in the specified range.
- Urgency
- Remediation is important as it can lead to device unavailability requiring a hardware reset.
- Action
- Update to a fixed version of FreeRTOS-Plus-TCP.
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Details
Original advisory: https://aws.amazon.com/security/security-bulletins/rss/2026-022-aws/
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-74240.22% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 13% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-7424 | coverage & exploitation status | NVD · CVE.org |
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