CVE-2020-12526

mediumPriorität · verfolgen · 21EPSS 0.010 · 61. PerzentilDEEURUUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
0.95% (61st) EPSS
CVSS 5 · medium
Is it mine?
13 products
Prüfe deine Angriffsfläche
Who says so?
5 sources
cnnvd · enisa_euvd · fstec_bdu · beckhoff_psirt

EPSS · bewertet 2026-10-27

TwinCAT OPC UA Server in versions up to 2.3.0.12 and IPC Diagnostics UA Server in versions up to 3.1.0.1 from Beckhoff Automation GmbH & Co. KG are vulnerable to denial of service attacks. The attacker needs to send several specifically crafted requests to the running OPC UA server. After some of these requests the OPC UA server is no longer responsive to any client. This is without effect to the real-time functionality of IPCs.

01

Behebungen

Hersteller-Fix, Mitigation oder Workaround, wie von den Quellen veröffentlicht.

Ein Hersteller-Fix ist verfügbar.

  • Behobenbeckhoff_psirt

    For devices running Windows but not Windows CE or TwinCAT/BSD please get a recent version of the OPC UA servers through the conventional ways and update your system. For devices running Windows CE please request a recent image via Beckhoff's support and apply it to your device. For the product CX8091 please use firmware version "CX8091_CE600_LF_v356f_TC211R3_B2306_v2" or later which can be downloaded at https://download.beckhoff.com/download/software/embPC-Control/CX80x0/CX8091/OPC-update Please note that the updated OPC UA server leaves less RAM available to your application on the CX8091.

  • Mitigationbeckhoff_psirt

    Consider disabling the IPC Diagnostics Server by stopping and disabling the corresponding Windows service or service. For example this can be achieved with the following PowerShell commands: Stop-Service -Force -Name DevMgrSvr-UA Set-Service -Name DevMgrSvr-UA -StartupType Disabled Alternatively consider limiting access to the TCP port the OPC UA server is listening on. This can happen with a dedicated firewall appliance which sits in front of an affected device. Alternatively at the device the Windows firewall can be configured to limit access to the TCP port. Further guidance is provided within the "Security Guide IPC" from Beckhoff which is accessible at https://www.beckhoff.com/secguide

02

cvss

Technischer Schweregrad, 0–10. Eine Zeile je Quelle.

5.3
010

Basiswert 0–10 · höher = schwerwiegender · Vektor überfahren zum Auflösen

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USAusnutzbarkeit 10 · Auswirkung 2.9
v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lprimary · NVD / NIST USAusnutzbarkeit 3.9 · Auswirkung 1.4
v3.15.3mediumAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · FSTEC (BDU) RU
v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · ENISA EU
v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · info@cert.vde.comAusnutzbarkeit 3.9 · Auswirkung 1.4
v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · Beckhoff PSIRT DE
v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:Usecondary · CVSS-BT (t0sche)
03

schwächen

Die CWE-Schwächeklassen, zu denen dies gehört.

CWE-20USprimärCWE-20USCWE-20US
04

betroffene Produkte (13)

Betroffene Produkte und Versionsbereiche.

05

Advisories (1)

Hersteller- und Ökosystem-Meldungen dazu.

  • VDE-2020-051Beckhoff: DoS-Vulnerability for TwinCAT OPC UA Server and IPC Diagnostics UA Server2021-04-27csaf · beckhoff_psirtDE

    Some TwinCAT OPC UA Server and IPC Diagnostics UA Server versions from Beckhoff Automation GmbH & Co. KG are vulnerable to denial of service attacks. The attacker needs to send several specifically crafted requests to the running OPC UA server. After some of these requests the OPC UA server is no longer responsive to any client. This is without effect to the real-time functionality of IPCs. UPDATE A - 11.05.2021 Please note that some hardware products from Beckhoff are shipped with a TwinCAT OPC UA Server pre-installed. In some cases the server is enabled by default. IPC Diagnostics UA Server (contained in Beckhoff's Windows images) server versions up to and including 3.1.0.1 are affected Please note that IPC products from Beckhoff are shipped with an IPC Diagnostics UA Server pre-installed. In all cases the server is disabled by default. The version numbers named above always refer to the version number which is accessible via OPC UA at the server via the standard OPC UA node /Objects/Server/ServerStatus/BuildInfo/SoftwareVersion and on Windows also as the file property "File version" of the file TcOpcUaServer.exe for TwinCAT OPC UA Server respectively the file DevMgrSvr-UA.exe for IPC Diagnostics UA Server. UPDATE A - 11.05.2021 Please note that IPC products from Beckhoff are shipped with an IPC Diagnostics UA Server pre-installed. While on Windows CE it is disabled by default all other Windows images have it enabled by default.

06

auch bekannt als (4)

Weitere Namen und Kennungen dieser Entität.

07

quellen

Welche Quellen diesen Datensatz belegen und wann.

cnnvdenisa_euvdfstec_bdubeckhoff_psirtnvdNVDCVE.orgMITRE
veröffentlicht 2021-05-13geändert 2026-06-17
09

Referenzen (6)

Externe Belege — Patches, Meldungen, Analysen.

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