CVE-2025-11482Network attack vector

Permanent OPC-UA denial of service via connection exhaustion

Published May 26, 2026 · Updated May 26, 2026

Resource exhaustion in the OPC-UA Server in B&R PPT30 Operating System before 1.8.0 allows remote attackers to make the service inaccessible. The server insufficiently handles resources across concurrent connections, allowing attacker-sent messages to exhaust connection capacity. Exploitation requires network access and the optional server to be enabled; successful attacks permanently prevent legitimate OPC-UA connections.

CVSS severity8.7
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in the OPC-UA Server in B&R PPT30 Operating System before 1.8.0 allows remote attackers to make the service inaccessible. The server insufficiently handles resources across concurrent connections, allowing attacker-sent messages to exhaust connection capacity. Exploitation requires network access and the optional server to be enabled; successful attacks permanently prevent legitimate OPC-UA connections.

The record

CVE
CVE-2025-11482
Published
May 26, 2026
Updated
May 26, 2026
Vendor
B&R Industrial Automation GmbH
Product
PPT30 Operating System
Classifications
CWE-770, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 26, 2026CVE publishedPublication date reported by the CVE source.
  2. May 26, 2026Record 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 <1.8.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

B&R Industrial Automation GmbH · PPT30 Operating Systemversion=0 <1.8.0

Published CVSS scores

7.5ABBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7ABBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
6.5ABB PSIRTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

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-770Allocation of Resources Without Limits or Throttling
T1499.003Application Exhaustion Flood

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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