CVE-2022-37012

Unified Automation OPC UA C++ Improper Update of Reference Count Denial-of-Service Vulnerability

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Attend

*SSVC

Descriptions

This vulnerability allows remote attackers to create a denial-of-service condition on affected installations of Unified Automation OPC UA C++ Demo Server 1.7.6-537. Authentication is not required to exploit this vulnerability. The specific flaw exists within the OpcUa_SecureListener_ProcessSessionCallRequest method. A crafted OPC UA message can force the server to incorrectly update a reference count. An attacker can leverage this vulnerability to create a denial-of-service condition on the system. Was ZDI-CAN-16927.

This vulnerability allows remote attackers to create a denial-of-service condition on affected installations of Unified Automation OPC UA C++ Demo Server. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the OpcUa_SecureListener_ProcessSessionCallRequest method. A crafted OPC UA message can force the server to incorrectly update a reference count. An attacker can leverage this vulnerability to create a denial-of-service condition on the system.

*Credits: 20urdjk

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:Attend

Exploitation

None

Automatable

Yes

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2022-07-28 CVE Reserved
2022-07-28 CVE Published
2025-02-18 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-911: Improper Update of Reference Count

CAPEC

References (2)

URL	Tag	Source
https://documentation.unified-automation.com/uasdkcpp/1.7.7/CHANGELOG.txt	Release Notes
https://www.zerodayinitiative.com/advisories/ZDI-22-1030	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Unified-automation Search vendor "Unified-automation"		Opc Ua C\+\+ Demo Server Search vendor "Unified-automation" for product "Opc Ua C\+\+ Demo Server"				1.7.6.537 Search vendor "Unified-automation" for product "Opc Ua C\+\+ Demo Server" and version "1.7.6.537"		-		Affected