CVE-2025-55081Network attack vector

Memory disclosure via unchecked ClientHello field lengths

Published Oct 15, 2025 · Updated Oct 15, 2025

Buffer over-read in Eclipse ThreadX NetX Duo before 6.4.4 allows remote attackers to read process memory via a crafted TLS ClientHello. The _nx_secure_tls_process_clienthello() parser trusts attacker-controlled cipher-suite and compression-method lengths without confirming that the declared fields remain inside the received message buffer. The target must expose a NetX Duo TLS server using the affected parser; no authentication or user interaction is required, and only confidentiality impact is reported.

CVSS severity6.9
Medium
EPSS probability0.37%
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 Eclipse ThreadX NetX Duo before 6.4.4 allows remote attackers to read process memory via a crafted TLS ClientHello. The _nx_secure_tls_process_clienthello() parser trusts attacker-controlled cipher-suite and compression-method lengths without confirming that the declared fields remain inside the received message buffer. The target must expose a NetX Duo TLS server using the affected parser; no authentication or user interaction is required, and only confidentiality impact is reported.

The record

CVE
CVE-2025-55081
Published
Oct 15, 2025
Updated
Oct 15, 2025
Vendor
The Eclipse Foundation
Product
Eclipse ThreadX NetX Duo
Classifications
CWE-126, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 15, 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=0 <6.4.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Eclipse Foundation · Eclipse ThreadX NetX Duoversion=0 <6.4.4

Published CVSS scores

9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
6.9Eclipse FoundationCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/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-126Buffer Over-read
T1190Exploit Public-Facing Application

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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