CVE-2026-7424

Integer Underflow in DHCPv6 Sub-Option Parser in FreeRTOS-Plus-TCP

Published Apr 29, 2026 CVSS 4.0 · 7.2 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
CPEs cpe:2.3:a:amazon:freertos-plus-tcp:*:*:*:*:*:*:*:*
Type Values Removed Values Added
First Time appeared Amazon
Amazon freertos-plus-tcp
Vendors & Products Amazon
Amazon freertos-plus-tcp
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Title Integer Underflow in DHCPv6 Sub-Option Parser in FreeRTOS-Plus-TCP
Weaknesses CWE-191
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H'}

cvssV4_0

{'score': 7.2, 'vector': 'CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
AMZN
Published
Updated
Apr 29, 2026, 10:13 PM
Reserved
Apr 29, 2026, 2:27 PM
Status
Analyzed
Published
Apr 29, 2026, 7:16 PM
Modified
Oct 26, 2026, 8:10 PM