CVE-2022-37012Network attack vector

Unauthenticated service interruption via incorrect reference-count update

Published Mar 29, 2023 · Updated Feb 18, 2025

Improper reference counting in Unified Automation OPC UA C++ Demo Server 1.7.6-537 allows remote attackers to interrupt service. The OpcUa_SecureListener_ProcessSessionCallRequest method incorrectly updates a reference count when processing a crafted OPC UA message. No authentication or user interaction is required; sending the malformed request over the network can stop the server from providing OPC UA service.

CVSS severity7.5
High
EPSS probability1.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper reference counting in Unified Automation OPC UA C++ Demo Server 1.7.6-537 allows remote attackers to interrupt service. The OpcUa_SecureListener_ProcessSessionCallRequest method incorrectly updates a reference count when processing a crafted OPC UA message. No authentication or user interaction is required; sending the malformed request over the network can stop the server from providing OPC UA service.

The record

CVE
CVE-2022-37012
Published
Mar 29, 2023
Updated
Feb 18, 2025
Vendor
Unified Automation
Product
OPC UA C++ Demo Server
Classifications
CWE-911, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 29, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 18, 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=1.7.6-537

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Unified Automation · OPC UA C++ Demo Serverversion=1.7.6-537

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5Zero Day InitiativeCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

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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-911Improper Update of Reference Count
T1499Endpoint Denial of Service

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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