CVE-2022-29865Network attack vector

Authentication bypass via noncanonical certificate-name comparison

Published Jun 16, 2022 · Updated Aug 3, 2024

Improper authentication in OPC UA .NET Standard Stack 1.4.368.53 and earlier allows remote attackers to connect as untrusted peers. Certificate validation compares X.500 distinguished names noncanonically, allowing a crafted certificate with reordered subject fields to match a trusted identity. The bypass affects Windows and macOS applications and requires certificate-authority trust settings that permit the crafted peer certificate.

CVSS severity6.5
Medium
EPSS probability1.65%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in OPC UA .NET Standard Stack 1.4.368.53 and earlier allows remote attackers to connect as untrusted peers. Certificate validation compares X.500 distinguished names noncanonically, allowing a crafted certificate with reordered subject fields to match a trusted identity. The bypass affects Windows and macOS applications and requires certificate-authority trust settings that permit the crafted peer certificate.

The record

CVE
CVE-2022-29865
Published
Jun 16, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-303, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 16, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record 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

6.5OPC FoundationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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-303Incorrect Implementation of Authentication Algorithm
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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