SSA-674753

csafDEsiemens_psirt

SSA-674753: Denial-of-Service Vulnerability in ET 200 Devices

view advisory published 2026-01-13

Siemens ET 200 devices contain a denial-of-service vulnerability that could be triggered by sending a valid S7 protocol Disconnect Request (COTP DR TPDU), causing the device to become unresponsive and require a power cycle to recover. Siemens has released new versions for several affected products and recommends to update to the latest versions. Siemens is preparing further fix versions and recommends specific countermeasures for products where fixes are not, or not yet available.

01

describes (1)

Related CVEs.

IDseverity exploitable
CVE-2025-40944US——
A vulnerability has been identified in SIMATIC ET 200AL IM 157-1 PN (6ES7157-1AB00-0AB0) (All versions), SIMATIC ET 200MP IM 155-5 PN HF (6ES7155-5AA00-0AC0) (All versions >= V4.2.…
02

references

External citations — patches, advisories, analysis.

03

remediations (34)

  • MitigationSIMATIC ET 200AL IM 157-1 PN (6ES7157-1AB00-0AB0)

    Filter the port 102 of the devices to only accepted connections to/from the IP addresses of machines that are trusted e.g. with an external firewall.

  • MitigationSIMATIC ET 200MP IM 155-5 PN HF (6ES7155-5AA00-0AC0)

    Filter the port 102 of the devices to only accepted connections to/from the IP addresses of machines that are trusted e.g. with an external firewall.

  • MitigationSIMATIC ET 200SP IM 155-6 MF HF (6ES7155-6MU00-0CN0)

    Filter the port 102 of the devices to only accepted connections to/from the IP addresses of machines that are trusted e.g. with an external firewall.

  • MitigationSIMATIC ET 200SP IM 155-6 PN HA (incl. SIPLUS variants)

    Filter the port 102 of the devices to only accepted connections to/from the IP addresses of machines that are trusted e.g. with an external firewall.

  • MitigationSIMATIC ET 200SP IM 155-6 PN R1 (6ES7155-6AU00-0HM0)

    Filter the port 102 of the devices to only accepted connections to/from the IP addresses of machines that are trusted e.g. with an external firewall.

  • MitigationSIMATIC ET 200SP IM 155-6 PN/2 HF (6ES7155-6AU01-0CN0)

    Filter the port 102 of the devices to only accepted connections to/from the IP addresses of machines that are trusted e.g. with an external firewall.

  • MitigationSIMATIC ET 200SP IM 155-6 PN/3 HF (6ES7155-6AU30-0CN0)

    Filter the port 102 of the devices to only accepted connections to/from the IP addresses of machines that are trusted e.g. with an external firewall.

  • MitigationSIMATIC PN/MF Coupler (6ES7158-3MU10-0XA0)

    Filter the port 102 of the devices to only accepted connections to/from the IP addresses of machines that are trusted e.g. with an external firewall.

  • MitigationSIMATIC PN/PN Coupler (6ES7158-3AD10-0XA0)

    Filter the port 102 of the devices to only accepted connections to/from the IP addresses of machines that are trusted e.g. with an external firewall.

  • MitigationSIPLUS ET 200MP IM 155-5 PN HF (6AG1155-5AA00-2AC0)

    Filter the port 102 of the devices to only accepted connections to/from the IP addresses of machines that are trusted e.g. with an external firewall.

  • MitigationSIPLUS ET 200MP IM 155-5 PN HF (6AG1155-5AA00-7AC0)

    Filter the port 102 of the devices to only accepted connections to/from the IP addresses of machines that are trusted e.g. with an external firewall.

  • MitigationSIPLUS ET 200MP IM 155-5 PN HF T1 RAIL (6AG2155-5AA00-1AC0)

    Filter the port 102 of the devices to only accepted connections to/from the IP addresses of machines that are trusted e.g. with an external firewall.

  • MitigationSIPLUS ET 200SP IM 155-6 PN HF (6AG1155-6AU01-2CN0)

    Filter the port 102 of the devices to only accepted connections to/from the IP addresses of machines that are trusted e.g. with an external firewall.

  • MitigationSIPLUS ET 200SP IM 155-6 PN HF (6AG1155-6AU01-7CN0)

    Filter the port 102 of the devices to only accepted connections to/from the IP addresses of machines that are trusted e.g. with an external firewall.

  • MitigationSIPLUS ET 200SP IM 155-6 PN HF T1 RAIL (6AG2155-6AU01-1CN0)

    Filter the port 102 of the devices to only accepted connections to/from the IP addresses of machines that are trusted e.g. with an external firewall.

  • MitigationSIPLUS ET 200SP IM 155-6 PN HF TX RAIL (6AG2155-6AU01-4CN0)

    Filter the port 102 of the devices to only accepted connections to/from the IP addresses of machines that are trusted e.g. with an external firewall.

  • MitigationSIPLUS NET PN/PN Coupler (6AG2158-3AD10-4XA0)

    Filter the port 102 of the devices to only accepted connections to/from the IP addresses of machines that are trusted e.g. with an external firewall.

  • No fix plannedSIMATIC ET 200AL IM 157-1 PN (6ES7157-1AB00-0AB0)

    Currently no fix is planned

  • No fix plannedSIMATIC ET 200MP IM 155-5 PN HF (6ES7155-5AA00-0AC0)

    Currently no fix is planned

  • No fix plannedSIMATIC ET 200SP IM 155-6 MF HF (6ES7155-6MU00-0CN0)

    Currently no fix is planned

  • No fix plannedSIMATIC PN/MF Coupler (6ES7158-3MU10-0XA0)

    Currently no fix is planned

  • No fix plannedSIPLUS ET 200MP IM 155-5 PN HF (6AG1155-5AA00-2AC0)

    Currently no fix is planned

  • No fix plannedSIPLUS ET 200MP IM 155-5 PN HF (6AG1155-5AA00-7AC0)

    Currently no fix is planned

  • No fix plannedSIPLUS ET 200MP IM 155-5 PN HF T1 RAIL (6AG2155-5AA00-1AC0)

    Currently no fix is planned

  • FixedSIMATIC ET 200SP IM 155-6 PN HA (incl. SIPLUS variants)

    Update to V1.3 or later version

    https://support.industry.siemens.com/cs/ww/en/view/109987451/
  • FixedSIMATIC ET 200SP IM 155-6 PN R1 (6ES7155-6AU00-0HM0)

    Update to V6.0.1 or later version

    https://support.industry.siemens.com/cs/ww/en/view/109816000/
  • FixedSIMATIC ET 200SP IM 155-6 PN/2 HF (6ES7155-6AU01-0CN0)

    Update to V4.2.5 or later version

    https://support.industry.siemens.com/cs/ww/en/view/109769765/
  • FixedSIMATIC ET 200SP IM 155-6 PN/3 HF (6ES7155-6AU30-0CN0)

    Update to V4.2.2 or later version

    https://support.industry.siemens.com/cs/ww/en/view/109769419/
  • FixedSIMATIC PN/PN Coupler (6ES7158-3AD10-0XA0)

    Update to V6.0.0 or later version

    https://support.industry.siemens.com/cs/ww/en/view/109760973/
  • FixedSIPLUS ET 200SP IM 155-6 PN HF (6AG1155-6AU01-2CN0)

    Update to V4.2.5 or later version

    https://support.industry.siemens.com/cs/ww/en/view/109769765/
  • FixedSIPLUS ET 200SP IM 155-6 PN HF (6AG1155-6AU01-7CN0)

    Update to V4.2.5 or later version

    https://support.industry.siemens.com/cs/ww/en/view/109769765/
  • FixedSIPLUS ET 200SP IM 155-6 PN HF T1 RAIL (6AG2155-6AU01-1CN0)

    Update to V4.2.5 or later version

    https://support.industry.siemens.com/cs/ww/en/view/109769765/
  • FixedSIPLUS ET 200SP IM 155-6 PN HF TX RAIL (6AG2155-6AU01-4CN0)

    Update to V4.2.5 or later version

    https://support.industry.siemens.com/cs/ww/en/view/109769765/
  • FixedSIPLUS NET PN/PN Coupler (6AG2158-3AD10-4XA0)

    Update to V6.0.0 or later version

    https://support.industry.siemens.com/cs/ww/en/view/109760973/
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