CVE-2025-55086

Unknown Unknown - Not Provided

BaseFortify

Publication date: 2025-10-20

Last updated on: 2025-10-24

Assigner: Eclipse Foundation

Description

In NetXDuo version before 6.4.4, a networking support module for Eclipse Foundation ThreadX, in the DHCPV6 client there was an unchecked index extracting the server DUID from the server reply. With a crafted packet, an attacker could cause an out of memory read.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2025-10-20

Last Modified

2025-10-24

Generated

2026-07-06

AI Q&A

2025-10-20

EPSS Evaluated

2026-07-05

NVD

CVE-2025-55086

EUVD

EUVD-2025-35094

Affected Vendors & Products

Vendor	Product	Version / Range
eclipse	threadx_netx_duo	to 6.4.4.202503 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-1285	The product receives input that is expected to specify an index, position, or offset into an indexable resource such as a buffer or file, but it does not validate or incorrectly validates that the specified index/position/offset has the required properties.
CWE-125	The product reads data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

This vulnerability in NetXDuo versions before 6.4.4 affects the DHCPv6 client module. It occurs because the code improperly validates the server DUID (DHCP Unique Identifier) received from a DHCPv6 server reply. Specifically, when extracting parts of the server DUID, the code fails to check the buffer length before reading the least significant word, leading to an out-of-bounds memory read. This can cause undefined behavior such as system crashes or memory corruption when processing a maliciously crafted DHCPv6 packet. [1]

Impact Analysis

Exploitation of this vulnerability can lead to system instability, crashes, or memory corruption on devices running vulnerable versions of NetXDuo. Since the attack can be performed remotely over the network without any privileges or user interaction, it poses a risk of denial of service or unexpected behavior in affected systems. [1]

Detection Guidance

This vulnerability can be detected by monitoring DHCPv6 client traffic for malformed or truncated DHCPv6 server reply packets that attempt to exploit the unchecked index when extracting the server DUID. Network packet capture tools like tcpdump or Wireshark can be used to capture DHCPv6 traffic and analyze server replies for anomalies. For example, using tcpdump: `tcpdump -i <interface> port 546 or port 547` to capture DHCPv6 client and server traffic. Additionally, checking system logs for crashes or memory corruption related to DHCPv6 client processes may indicate exploitation attempts. However, no specific detection commands or signatures are provided in the resources. [1]

Mitigation Strategies

The immediate mitigation step is to upgrade NetXDuo to version 6.4.4 or later, where the vulnerability has been patched by adding proper validation checks before reading the server DUID. Until the upgrade can be applied, consider restricting or monitoring DHCPv6 server traffic from untrusted sources to reduce exposure to crafted malicious packets exploiting this vulnerability. [1]

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