CVE-2025-55102Network attack vector

Remote IPv6 outage via persistent ND cache exhaustion

Published Jan 27, 2026 · Updated Jan 27, 2026

Denial of service in Eclipse ThreadX NetX Duo 6.4.3 and earlier allows remote attackers to block new IPv6 communication. The IPv6 Packet Too Big handler creates neighbor-discovery cache entries for spoofed source addresses, but leaves them permanently in the CREATED state instead of probing, aging, or reclaiming them. More than 15 distinct spoofed sources can exhaust the cache without authentication or user interaction, blocking communication with new IPv6 addresses until the device is power-cycled.

CVSS severity8.7
High
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Eclipse ThreadX NetX Duo 6.4.3 and earlier allows remote attackers to block new IPv6 communication. The IPv6 Packet Too Big handler creates neighbor-discovery cache entries for spoofed source addresses, but leaves them permanently in the CREATED state instead of probing, aging, or reclaiming them. More than 15 distinct spoofed sources can exhaust the cache without authentication or user interaction, blocking communication with new IPv6 addresses until the device is power-cycled.

The record

CVE
CVE-2025-55102
Published
Jan 27, 2026
Updated
Jan 27, 2026
Vendor
The Eclipse Foundation
Product
Eclipse ThreadX NetX Duo
Classifications
CWE-770, CWE-400, CWE-404, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 27, 2026Record 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=0 <=6.4.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Eclipse Foundation · Eclipse ThreadX NetX Duoversion=0 <=6.4.3

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7Eclipse FoundationCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
CWE-400Uncontrolled Resource Consumption
CWE-404Improper Resource Shutdown or Release
T1499.003Application Exhaustion Flood

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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