CVE-2025-11618Network attack vector

Authenticated service interruption via unchecked UDP/IPv6 version field

Published Oct 10, 2025 · Updated Oct 10, 2025

Invalid pointer dereference in FreeRTOS-Plus-TCP 4.0.0 through 4.3.3 allows remote authenticated users to interrupt IPv6 networking. When ipconfigDRIVER_INCLUDED_RX_IP_CHECKSUM is disabled, UDP/IPv6 processing accepts a packet with the wrong IP version, uses incorrect pointer arithmetic to extract its network buffer, and dereferences the resulting invalid pointer. IPv6 support and the disabled receive-checksum setting are required; the published impact is limited to reduced availability, with no reported data disclosure or modification.

CVSS severity5.3
Medium
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Invalid pointer dereference in FreeRTOS-Plus-TCP 4.0.0 through 4.3.3 allows remote authenticated users to interrupt IPv6 networking. When ipconfigDRIVER_INCLUDED_RX_IP_CHECKSUM is disabled, UDP/IPv6 processing accepts a packet with the wrong IP version, uses incorrect pointer arithmetic to extract its network buffer, and dereferences the resulting invalid pointer. IPv6 support and the disabled receive-checksum setting are required; the published impact is limited to reduced availability, with no reported data disclosure or modification.

The record

CVE
CVE-2025-11618
Published
Oct 10, 2025
Updated
Oct 10, 2025
Vendor
Amazon Web Services
Product
FreeRTOS-Plus-TCP
Classifications
CWE-476, T1499.004
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:N/VI:N/VA:L/SC:N/SI:N/SA:N
4.3Amazon Web ServicesCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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