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Fencer Vulns
critical 9.8

CVE-2025-40771 json

A vulnerability has been identified in SIMATIC CP 1542SP-1 (6GK7542-6UX00-0XE0) (All versions < V2.4.24), SIMATIC CP 1542SP-1 IRC (6GK7542-…

published 2025-10-14 12 mo ago modified 2026-10-23 16 d ago also EUVD-2025-34160

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 44%
public exploits
0
none known

Summary

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.

Patch / fix

  • Siemens SIMATIC CP 1542SP-1 V2.4.24
  • Siemens SIMATIC CP 1542SP-1 IRC V2.4.24
  • Siemens SIMATIC CP 1543SP-1 V2.4.24
  • Siemens SIPLUS ET 200SP CP 1542SP-1 IRC TX RAIL V2.4.24
  • Siemens SIPLUS ET 200SP CP 1543SP-1 ISEC V2.4.24
  • Siemens SIPLUS ET 200SP CP 1543SP-1 ISEC TX RAIL V2.4.24

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-25-289-07 updated cvss 9.8

Siemens SIMATIC ET 200SP Communication Processors

  • Siemens SIMATIC CP 1542SP-1 (6GK7542-6UX00-0XE0) < 2.4.24 Siemens SIMATIC CP 1542SP-1 IRC (6GK7542-6VX00-0XE0) < 2.4.24 Siemens SIMATIC CP 1543SP-1 (6GK7543-6WX00-0XE0) < 2.4.24 Siemens SIPLUS ET 200SP CP 1542SP-1 IRC TX RAIL (6AG2542-6VX00-4XE0) < 2.4.24 Siemens SIPLUS ET 200SP CP 1543SP-1 ISEC (6AG1543-6WX00-7XE0) < 2.4.24 Siemens SIPLUS ET 200SP CP 1543SP-1 ISEC TX RAIL (6AG2543-6WX00-4XE0) < 2.4.24
    affected: fixed in V2.4.24, mitigation support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
12 mo ago

Exploit prediction

0.53% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 4.0 9.3 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA 4.0 9.3 CVSS: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:X

Affected products

  • Siemens SIMATIC CP 1542SP-1
  • Siemens SIMATIC CP 1542SP-1 IRC
  • Siemens SIMATIC CP 1543SP-1
  • Siemens SIPLUS ET 200SP CP 1542SP-1 IRC TX RAIL
  • Siemens SIPLUS ET 200SP CP 1543SP-1 ISEC
  • Siemens SIPLUS ET 200SP CP 1543SP-1 ISEC TX RAIL

Classification

Weakness
  • CWE-306 Missing Authentication for Critical Functionality

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.