CVE-2022-25903Network attack vector

Service crash via unbounded recursive decoding

Published Aug 24, 2022 · Updated Sep 17, 2024

Uncontrolled recursion in the Rust opcua crate before 0.11.0 allows remote attackers to crash a client or server with nested OPC UA data. The ExtensionObject and Variant decoders recursively decode nested values without consuming a depth budget, allowing a small message to exhaust the call stack. An unauthenticated network peer can trigger a stack overflow and interrupt the process; no confidentiality or integrity impact is reported.

CVSS severity7.5
High
EPSS probability1.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled recursion in the Rust opcua crate before 0.11.0 allows remote attackers to crash a client or server with nested OPC UA data. The ExtensionObject and Variant decoders recursively decode nested values without consuming a depth budget, allowing a small message to exhaust the call stack. An unauthenticated network peer can trigger a stack overflow and interrupt the process; no confidentiality or integrity impact is reported.

The record

CVE
CVE-2022-25903
Published
Aug 24, 2022
Updated
Sep 17, 2024
Vendor
FreeOpcUa
Product
FreeOpcUa
Classifications
CWE-400, CWE-787, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 24, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.0.0 <unspecified

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FreeOpcUa · FreeOpcUaversion=0.0.0 <unspecified

Published CVSS scores

7.5SnykCVSS:3.1/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.

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-400Uncontrolled Resource Consumption
CWE-787Out-of-bounds Write
T1499.004Application or System Exploitation

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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