7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2022-29863

CVE-2022-29863: Memory Allocation with Excessive Size Value in OPCFoundation.NetStandard.Opc.Ua.Core

A vulnerability was discovered in the OPC UA .NET Standard Stack that allows a malicious client to cause a server to trigger an out of memory exception with a carefully crafted message.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2022-29863

CVE-2022-29863:

7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
OPCFoundation.NetStandard.Opc.Ua.Core	nuget	<= 1.4.368.53	1.4.368.58

Technical Details

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Root Cause Analysis

The vulnerability (CWE-789) stems from improper validation of size values during message deserialization. The OPC UA .NET Standard Stack's BinaryDecoder class handles decoding of variable-length data types like byte arrays, strings, and arrays. These functions read size values directly from untrusted input and allocate memory based on these values. Without proper bounds checking, a malicious client can supply excessively large size values, leading to uncontrolled memory allocation. The high confidence stems from the vulnerability's nature (memory allocation without limits) and the fact that these decoding functions are the primary points where such unchecked allocations would occur in a message processing stack.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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