CVE Tools
Sign in

CVE-2026-7424

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

Published: Apr 29, 2026Updated: May 4, 2026 Sources: CVE List NVDCWE-191
8.1HIGH
NVD MITRE
EPSS Score
0.2%
Top 87.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:AAC:LPR:NUI:NS:UC:NI:HA:H
Exploitability
AV:AAttack Vector
Adjacent
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-191

Affected Products

freertos-plus-tcpamazonICS / OT / IoT
FreeRTOS-Plus-TCPAWS
EmbeddedLibrary
Cloud & SaaS
amazoncommercialUSCloud & SaaS
awscommercialUSCloud & SaaSaka aws

Exploitability

Official Patch Available
No detection template yetWe can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

https://aws.amazon.com/security/security-bulletins/2026-022-aws/
aws.amazon.com
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6
github.com
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1
github.com
and 1 more references View all →

Timeline

Published
Apr 29, 2026
Last Updated
May 4, 2026

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2026-7424 and every CVE in our database. Create a free account — no credit card required.

Create Free Account
Plain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows