CVE•Published 2025-12-09•Modified 2026-10-07•1 article on news•5 live references•NVD data
CVE-2025-40938Siemens · Simatic_cn_4100_firmware
Vulnerability data via NVD (ingested)
CVSS v3.1
8.1
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS percentile
30
Exploit Prediction Scoring System · top 70% of all CVEs
Weaknesses (CWE)
Description
A vulnerability has been identified in SIMATIC CN 4100 (All versions < V4.0.1). The affected device stores sensitive information in the firmware. This could allow an attacker to access and misuse this information, potentially impacting the device’s confidentiality, integrity, and availability.
Timeline
Published 2025-12-09
Modified 2026-10-07
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2025-40938Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · OS
os:"Simatic Cn 4100 Firmware"Hosts Shodan identified as running Simatic Cn 4100 Firmware.
More intel sources (5)
Shodan report
vuln:CVE-2025-40938Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2025-40938Censys host search filtered to this CVE id.
grep.app
CVE-2025-40938Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2025-40938GitHub code search for direct mentions.
Google dork
"CVE-2025-40938" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2025-40938 on GitHub.