CVE-2025-40577: scalance lpe9403 Out-of-bounds Read

Description

A vulnerability has been identified in SCALANCE LPE9403 (6GK5998-3GS00-2AC2) (All versions < V4.0 HF0). Affected devices do not properly validate incoming Profinet packets. An unauthenticated remote attacker can exploit this flaw by sending a specially crafted malicious packet, which leads to a crash of the dcpd process.

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CVSS v3.1 Score

4.3

MEDIUM

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Weakness Type (CWE)

CWE-125 Out-of-bounds Read

Affected Products

Vendor	Product	Versions
siemens	scalance_lpe9403_firmware	All
siemens	scalance_lpe9403	All

References

Advisories & Patches

https://cert-portal.siemens.com/productcert/html/ssa-327438.html

Frequently Asked Questions

What is CVE-2025-40577? +

A vulnerability has been identified in SCALANCE LPE9403 (6GK5998-3GS00-2AC2) (All versions < V4.0 HF0). Affected devices do not properly validate incoming Profinet packets. An unauthenticated remote attacker can exploit this flaw by sending a specially crafted malicious packet, which leads to a crash of the dcpd process. It has a CVSS v3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2025-40577? +

CVE-2025-40577 has a CVSS v3.1 score of 4.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-40577? +

CVE-2025-40577 affects products from siemens, specifically: scalance_lpe9403, scalance_lpe9403_firmware. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-40577? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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