CVE-2025-40771

criticalpriority · track · 0OT risk · elevatedEPSS 0.005 · 44 %ileDEEUNLRUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.53% (44th) EPSS

CVSS 9.8 · critical

Is it mine?

41 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · cisa_csaf_ot

EPSS · scored 2026-10-27

A vulnerability has been identified in SIMATIC CP 1542SP-1 (6GK7542-6UX00-0XE0) (All versions < V2.4.24), SIMATIC CP 1542SP-1 IRC (6GK7542-6VX00-0XE0) (All versions < V2.4.24), SIMATIC CP 1543SP-1 (6GK7543-6WX00-0XE0) (All versions < V2.4.24), SIPLUS ET 200SP CP 1542SP-1 IRC TX RAIL (6AG2542-6VX00-4XE0) (All versions < V2.4.24), SIPLUS ET 200SP CP 1543SP-1 ISEC (6AG1543-6WX00-7XE0) (All versions < V2.4.24), SIPLUS ET 200SP CP 1543SP-1 ISEC TX RAIL (6AG2543-6WX00-4XE0) (All versions < V2.4.24). Affected devices do not properly authenticate configuration connections. This could allow an unauthenticated remote attacker to access the configuration data.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedSIMATIC CP 1542SP-1 (6GK7542-6UX00-0XE0)siemens_psirt
Update to V2.4.24 or later version
https://support.industry.siemens.com/cs/ww/en/view/109995159/
FixedSIMATIC CP 1542SP-1 IRC (6GK7542-6VX00-0XE0)siemens_psirt
Update to V2.4.24 or later version
https://support.industry.siemens.com/cs/ww/en/view/109995159/
FixedSIMATIC CP 1543SP-1 (6GK7543-6WX00-0XE0)siemens_psirt
Update to V2.4.24 or later version
https://support.industry.siemens.com/cs/ww/en/view/109995159/
FixedSIPLUS ET 200SP CP 1542SP-1 IRC TX RAIL (6AG2542-6VX00-4XE0)siemens_psirt
Update to V2.4.24 or later version
https://support.industry.siemens.com/cs/ww/en/view/109995159/
FixedSIPLUS ET 200SP CP 1543SP-1 ISEC (6AG1543-6WX00-7XE0)siemens_psirt
Update to V2.4.24 or later version
https://support.industry.siemens.com/cs/ww/en/view/109995159/
FixedSIPLUS ET 200SP CP 1543SP-1 ISEC TX RAIL (6AG2543-6WX00-4XE0)siemens_psirt
Update to V2.4.24 or later version
https://support.industry.siemens.com/cs/ww/en/view/109995159/
FixedSIMATIC CP 1542SP-1 (6GK7542-6UX00-0XE0)cisa_csaf_ot
Update to V2.4.24 or later version
https://support.industry.siemens.com/cs/ww/en/view/109995159/
FixedSIMATIC CP 1542SP-1 IRC (6GK7542-6VX00-0XE0)cisa_csaf_ot
Update to V2.4.24 or later version
https://support.industry.siemens.com/cs/ww/en/view/109995159/
FixedSIMATIC CP 1543SP-1 (6GK7543-6WX00-0XE0)cisa_csaf_ot
Update to V2.4.24 or later version
https://support.industry.siemens.com/cs/ww/en/view/109995159/
FixedSIPLUS ET 200SP CP 1542SP-1 IRC TX RAIL (6AG2542-6VX00-4XE0)cisa_csaf_ot
Update to V2.4.24 or later version
https://support.industry.siemens.com/cs/ww/en/view/109995159/
FixedSIPLUS ET 200SP CP 1543SP-1 ISEC (6AG1543-6WX00-7XE0)cisa_csaf_ot
Update to V2.4.24 or later version
https://support.industry.siemens.com/cs/ww/en/view/109995159/
FixedSIPLUS ET 200SP CP 1543SP-1 ISEC TX RAIL (6AG2543-6WX00-4XE0)cisa_csaf_ot
Update to V2.4.24 or later version
https://support.industry.siemens.com/cs/ww/en/view/109995159/
MitigationSIMATIC CP 1542SP-1 (6GK7542-6UX00-0XE0)siemens_psirt
Restrict access to the affected systems to trusted IP addresses only
MitigationSIMATIC CP 1542SP-1 IRC (6GK7542-6VX00-0XE0)siemens_psirt
Restrict access to the affected systems to trusted IP addresses only
MitigationSIMATIC CP 1543SP-1 (6GK7543-6WX00-0XE0)siemens_psirt
Restrict access to the affected systems to trusted IP addresses only
MitigationSIPLUS ET 200SP CP 1542SP-1 IRC TX RAIL (6AG2542-6VX00-4XE0)siemens_psirt
Restrict access to the affected systems to trusted IP addresses only
MitigationSIPLUS ET 200SP CP 1543SP-1 ISEC (6AG1543-6WX00-7XE0)siemens_psirt
Restrict access to the affected systems to trusted IP addresses only
MitigationSIPLUS ET 200SP CP 1543SP-1 ISEC TX RAIL (6AG2543-6WX00-4XE0)siemens_psirt
Restrict access to the affected systems to trusted IP addresses only
MitigationSIMATIC CP 1542SP-1 (6GK7542-6UX00-0XE0)cisa_csaf_ot
Restrict access to the affected systems to trusted IP addresses only
MitigationSIMATIC CP 1542SP-1 IRC (6GK7542-6VX00-0XE0)cisa_csaf_ot
Restrict access to the affected systems to trusted IP addresses only
MitigationSIMATIC CP 1543SP-1 (6GK7543-6WX00-0XE0)cisa_csaf_ot
Restrict access to the affected systems to trusted IP addresses only
MitigationSIPLUS ET 200SP CP 1542SP-1 IRC TX RAIL (6AG2542-6VX00-4XE0)cisa_csaf_ot
Restrict access to the affected systems to trusted IP addresses only
MitigationSIPLUS ET 200SP CP 1543SP-1 ISEC (6AG1543-6WX00-7XE0)cisa_csaf_ot
Restrict access to the affected systems to trusted IP addresses only
MitigationSIPLUS ET 200SP CP 1543SP-1 ISEC TX RAIL (6AG2543-6WX00-4XE0)cisa_csaf_ot
Restrict access to the affected systems to trusted IP addresses only

cvss

Technical severity, 0–10. One row per scoring source.

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 8.1–9.8

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · NCSC-NL NL

v3.19.8criticalAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · productcert@siemens.com DEexploitability 3.9 · impact 5.9

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · Siemens ProductCERT DE

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · CISA US

v4.09.3criticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:Nsecondary · ENISA EU

v4.09.3criticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · productcert@siemens.com DE

v4.08.1highCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-306USCWE-306USCWE-306USCWE-306USCWE-306US

affected products (41)

Products and version ranges known to be affected.

SIMATIC CP 1542SP-1 (6GK7542-6UX00-0XE0)all versionscisa_csaf_otUS
SIMATIC CP 1542SP-1 IRC (6GK7542-6VX00-0XE0)all versionscisa_csaf_otUS
SIMATIC CP 1543SP-1 (6GK7543-6WX00-0XE0)all versionscisa_csaf_otUS
SIPLUS ET 200SP CP 1542SP-1 IRC TX RAIL (6AG2542-6VX00-4XE0)all versionscisa_csaf_otUS
SIPLUS ET 200SP CP 1543SP-1 ISEC (6AG1543-6WX00-7XE0)all versionscisa_csaf_otUS
SIPLUS ET 200SP CP 1543SP-1 ISEC TX RAIL (6AG2543-6WX00-4XE0)all versionscisa_csaf_otUS
Siemens SIMATIC CP 1542SP-1 (6GK7542-6UX00-0XE0)≤ vers:intdot/<2.4.24cisa_csaf_otUS
Siemens SIMATIC CP 1542SP-1 IRC (6GK7542-6VX00-0XE0)≤ vers:intdot/<2.4.24cisa_csaf_otUS
Siemens SIMATIC CP 1543SP-1 (6GK7543-6WX00-0XE0)≤ vers:intdot/<2.4.24cisa_csaf_otUS
Siemens SIPLUS ET 200SP CP 1542SP-1 IRC TX RAIL (6AG2542-6VX00-4XE0)≤ vers:intdot/<2.4.24cisa_csaf_otUS
Siemens SIPLUS ET 200SP CP 1543SP-1 ISEC (6AG1543-6WX00-7XE0)≤ vers:intdot/<2.4.24cisa_csaf_otUS
Siemens SIPLUS ET 200SP CP 1543SP-1 ISEC TX RAIL (6AG2543-6WX00-4XE0)≤ vers:intdot/<2.4.24cisa_csaf_otUS
Siemens SIMATIC CP 1542SP-10 → V2.4.24enisa_euvdEU
Siemens SIMATIC CP 1542SP-1 IRC0 → V2.4.24enisa_euvdEU
Siemens SIMATIC CP 1543SP-10 → V2.4.24enisa_euvdEU
Siemens SIPLUS ET 200SP CP 1542SP-1 IRC TX RAIL0 → V2.4.24enisa_euvdEU
Siemens SIPLUS ET 200SP CP 1543SP-1 ISEC0 → V2.4.24enisa_euvdEU
Siemens SIPLUS ET 200SP CP 1543SP-1 ISEC TX RAIL0 → V2.4.24enisa_euvdEU
Siemens AG SIMATIC CP 1542SP-1≤ 2.4.24fstec_bduRU
Siemens AG SIMATIC CP 1542SP-1 IRC≤ 2.4.24fstec_bduRU

showing 20 of 41

advisories (3)

Vendor and ecosystem advisories describing this.

NCSC-2025-0309Kwetsbaarheden verholpen in Siemens productenNL2025-10-14csaf · ncsc_nlNL
Siemens heeft kwetsbaarheden verholpen in diverse producten als SIMATIC, SINEC, SIPLUS en Solid Edge.
SSA-486936SSA-486936: Authentication Vulnerability in SIMATIC ET 200SP Communication Processors2025-10-14csaf · siemens_psirtDE
SIMATIC ET 200SP communication processors (CP 1542SP-1, CP 1542SP-1 IRC and CP 1543SP-1, incl. SIPLUS variants) contain an authentication vulnerability that could allow an unauthenticated remote attacker to access the configuration data. Siemens has released new versions for the affected products and recommends to update to the latest versions.
ICSA-25-289-07Siemens SIMATIC ET 200SP Communication Processors2025-10-14icsa · cisa_csaf_otUS
SIMATIC ET 200SP communication processors (CP 1542SP-1, CP 1542SP-1 IRC and CP 1543SP-1, incl. SIPLUS variants) contain an authentication vulnerability that could allow an unauthenticated remote attacker to access the configuration data. Siemens has released new versions for the affected products and recommends to update to the latest versions.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cisa_csaf_ot ncsc_nl siemens_psirt NVD CVE.org MITRE

published 2025-10-14modified 2026-10-23

references (4)

External citations — patches, advisories, analysis.

scry

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