CVE-2022-25888Network attack vector

Unauthenticated DoS via unlimited OPC UA chunks

Published Aug 23, 2022 · Updated Sep 16, 2024

Denial of service in locka99 opcua before an unspecified fixed version allows remote attackers to interrupt service via oversized OPC UA chunks. The message decoder accepts unlimited chunks, including huge chunks, without enforcing per-session or global limits or requiring a Final closing chunk. No authentication or user interaction is required, and the bounded consequence is resource exhaustion that can hang or stop OPC UA service.

CVSS severity7.5
High
EPSS probability1.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in locka99 opcua before an unspecified fixed version allows remote attackers to interrupt service via oversized OPC UA chunks. The message decoder accepts unlimited chunks, including huge chunks, without enforcing per-session or global limits or requiring a Final closing chunk. No authentication or user interaction is required, and the bounded consequence is resource exhaustion that can hang or stop OPC UA service.

The record

CVE
CVE-2022-25888
Published
Aug 23, 2022
Updated
Sep 16, 2024
Vendor
locka99
Product
opcua
Classifications
CWE-770, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 23, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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?

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  1. Affected versionversion=0.0.0 <unspecified

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

locka99 · opcuaversion=0.0.0 <unspecified

Published CVSS scores

7.5NVDCVSS: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.

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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-770Allocation of Resources Without Limits or Throttling
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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