CVE-2025-11616Network attack vector

Memory disclosure via undersized ICMPv6 message parsing

Published Oct 10, 2025 · Updated Oct 10, 2025

Buffer over-read in FreeRTOS-Plus-TCP 4.0.0 through 4.3.3 allows remote authenticated users to read adjacent memory via short ICMPv6 packets. The prvProcessICMPMessage_IPv6 path dispatches type-specific ICMPv6 structures without first confirming that the received buffer meets each message type's minimum size. IPv6 support must be enabled, and a network-reachable low-privileged sender can expose adjacent memory and interrupt the affected embedded application.

CVSS severity5.4
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer over-read in FreeRTOS-Plus-TCP 4.0.0 through 4.3.3 allows remote authenticated users to read adjacent memory via short ICMPv6 packets. The prvProcessICMPMessage_IPv6 path dispatches type-specific ICMPv6 structures without first confirming that the received buffer meets each message type's minimum size. IPv6 support must be enabled, and a network-reachable low-privileged sender can expose adjacent memory and interrupt the affected embedded application.

The record

CVE
CVE-2025-11616
Published
Oct 10, 2025
Updated
Oct 10, 2025
Vendor
Amazon Web Services
Product
FreeRTOS-Plus-TCP
Classifications
CWE-126, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 10, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 10, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.0.0 <4.3.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Amazon Web Services · FreeRTOS-Plus-TCPversion=4.0.0 <4.3.4

Published CVSS scores

5.3Amazon Web ServicesCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
5.4Amazon Web ServicesCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-126Buffer Over-read
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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