CVE-2024-42512Network attack vector

Unauthenticated data access via unblocked validation failures

Published Feb 10, 2025 · Updated Feb 11, 2025

Authentication bypass in OPC UA .NET Standard Stack before 1.5.374.158 allows remote attackers to read server data without authentication. The TCP transport fails to track or block repeated Basic128Rsa15 messages that fail security validation, leaving authentication timing observable across attempts. Exploitation requires the deprecated Basic128Rsa15 policy, which is disabled by default, and compromises confidentiality without a reported integrity or availability impact.

CVSS severity5.9
Medium
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in OPC UA .NET Standard Stack before 1.5.374.158 allows remote attackers to read server data without authentication. The TCP transport fails to track or block repeated Basic128Rsa15 messages that fail security validation, leaving authentication timing observable across attempts. Exploitation requires the deprecated Basic128Rsa15 policy, which is disabled by default, and compromises confidentiality without a reported integrity or availability impact.

The record

CVE
CVE-2024-42512
Published
Feb 10, 2025
Updated
Feb 11, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-208, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 10, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 11, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.6CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
5.9OPC FoundationCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A: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-208Observable Timing Discrepancy
T1210Exploitation of Remote Services

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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