High severity · published May 12, 2026
CVE-2026-22925
A vulnerability has been identified in SIMATIC CN 4100 (All versions < V5.0)
7.5
CVSS
0.3%
EPSS
No
On KEV
Description
A vulnerability has been identified in SIMATIC CN 4100 (All versions < V5.0). The affected application is susceptible to resource exhaustion when subjected to high volume of TCP SYN packets
This could allow an attacker to render the service unavailable and cause denial-of-service conditions by overwhelming system resources.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 25% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SC
SIMATIC CN 4100 · Siemens
before V5.0 · source: vendor
SC
Simatic CN 4100 Firmware · Siemens
before 5.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-22925
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-22925
Mitigation
https://cert-portal.siemens.com/productcert/html/ssa-032379.html
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