CVE-2026-7425: CWE-125: Out-of-bounds Read in AWS FreeRTOS-Plus-TCP
Bulletin ID: 2026-023-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 2026/04/29 12:30 PM PDT Description: FreeRTOS-Plus-TCP is an open source TCP/IP stack implementation designed for FreeRTOS, providing a standard Berkeley sockets interface and support for essential networking protocols including IPv6, ARP, DHCP, DNS, and Router Advertisement (RA). We identified CVE-2026-7425 and CVE-2026-7426, one of them being out-of-bounds read and another one being out-of-bounds write issues respectively in the IPv6 Router Advertisement option parser where insufficient validation of length fields allows memory operations without proper bounds checking. Either issue can be exploited by any device on the local network that can send crafted Router Advertisement packets. No authentication or user interaction is required. Impacted versions: >=V4.0.0 AND =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.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-7425) involves an out-of-bounds read (CWE-125) in the IPv6 Router Advertisement parser component of AWS FreeRTOS-Plus-TCP. Specifically, the flaw occurs when processing a truncated PREFIX_INFORMATION option in Router Advertisements, which can cause the device to crash, leading to denial of service. It affects versions before 4.2.6 and 4.4.1. AWS provides this as a cloud service and has issued patches to remediate the issue.
Potential Impact
An adjacent network attacker can exploit this vulnerability by sending a crafted IPv6 Router Advertisement packet with a truncated PREFIX_INFORMATION option. This triggers an out-of-bounds read in the parser, causing the device to crash and resulting in denial of service. There is no impact on confidentiality or integrity reported. No known exploits are currently in the wild.
Mitigation Recommendations
AWS manages remediation for this cloud-hosted service and has released fixed versions 4.2.6 and 4.4.1 of FreeRTOS-Plus-TCP that address this vulnerability. Users are advised to upgrade to these patched versions once available. Check the AWS security advisory at https://aws.amazon.com/security/security-bulletins/2026-023-aws/ for the latest remediation guidance.
CVE-2026-7425: CWE-125: Out-of-bounds Read in AWS FreeRTOS-Plus-TCP
Description
Bulletin ID: 2026-023-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 2026/04/29 12:30 PM PDT Description: FreeRTOS-Plus-TCP is an open source TCP/IP stack implementation designed for FreeRTOS, providing a standard Berkeley sockets interface and support for essential networking protocols including IPv6, ARP, DHCP, DNS, and Router Advertisement (RA). We identified CVE-2026-7425 and CVE-2026-7426, one of them being out-of-bounds read and another one being out-of-bounds write issues respectively in the IPv6 Router Advertisement option parser where insufficient validation of length fields allows memory operations without proper bounds checking. Either issue can be exploited by any device on the local network that can send crafted Router Advertisement packets. No authentication or user interaction is required. Impacted versions: >=V4.0.0 AND =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.
CVSS v3.1
Score 6.5medium
Affected software
AWS
FreeRTOS-Plus-TCP
pkg:github/freertos/FreeRTOS-Plus-TCPpkg:github/FreeRTOS-Plus-TCPRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-7425) involves an out-of-bounds read (CWE-125) in the IPv6 Router Advertisement parser component of AWS FreeRTOS-Plus-TCP. Specifically, the flaw occurs when processing a truncated PREFIX_INFORMATION option in Router Advertisements, which can cause the device to crash, leading to denial of service. It affects versions before 4.2.6 and 4.4.1. AWS provides this as a cloud service and has issued patches to remediate the issue.
Potential Impact
An adjacent network attacker can exploit this vulnerability by sending a crafted IPv6 Router Advertisement packet with a truncated PREFIX_INFORMATION option. This triggers an out-of-bounds read in the parser, causing the device to crash and resulting in denial of service. There is no impact on confidentiality or integrity reported. No known exploits are currently in the wild.
Mitigation Recommendations
AWS manages remediation for this cloud-hosted service and has released fixed versions 4.2.6 and 4.4.1 of FreeRTOS-Plus-TCP that address this vulnerability. Users are advised to upgrade to these patched versions once available. Check the AWS security advisory at https://aws.amazon.com/security/security-bulletins/2026-023-aws/ for the latest remediation guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- AMZN
- Date Reserved
- 2026-04-29T14:27:51.904Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Is Cloud Service
- true
- Vendor Advisory Urls
- [{"url":"https://aws.amazon.com/security/security-bulletins/2026-023-aws/","vendor":"AWS"}]
Threat ID: 69f25db7cbff5d861043482f
Added to database: 04/29/2026, 19:36:23 UTC
Last enriched: 06/05/2026, 19:30:24 UTC
Last updated: 09/11/2026, 22:06:35 UTC
Views: 165
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