ICSA-23-257-06: Siemans WIBU Systems CodeMeter

CISA's summary

Summary: WIBU Systems published information about a heap buffer overflow vulnerability and associated fix releases of CodeMeter Runtime, a product provided by WIBU Systems and used in several Siemens industrial products for license management. The vulnerability is described in the section 'Vulnerability Classification' below and got assigned the CVE ID CVE-2023-3935. Successful exploitation of this vulnerability could allow - an unauthenticated remote attacker to execute code on vulnerable products, where CodeMeter Runtime (i.e., CodeMeter.exe) is configured as a server, or - an authenticated local attacker to gain root/admin privileges on vulnerable products, where CodeMeter Runtime is configured as a client. Siemens has released new versions for several affected products and recommends to update to the latest versions. Siemens recommends specific countermeasures for products where fixes are not, or not yet available.

Products, as the advisory lists them

DeSpy has not checked any unit, hardware revision or firmware.

Vulnerabilities in this advisory

• CVE-2023-3935 — CVE-2023-3935 · CWE-122

  In CodeMeter Runtime versions up to 7.60b, there is a heap buffer overflow vulnerability which can potentially lead to a remote code execution. Currently, no PoC is known to us. To exploit the heap overflow, additional protection mechanisms need to be broken. Remote access is only possible if CodeMeter is configured as a server. If CodeMeter is not configured as a server, the adversary would need to log in to the machine where the CodeMeter Runtime is running or trick the user into sending a malicious request to CodeMeter. This might result in an escalation of privilege. (WIBU-230704-01)

Acknowledgments, as the advisory lists them

• Siemens ProductCERT: reporting this vulnerability to CISA.

The advisory's legal notice

Siemens Security Advisories are subject to the terms and conditions contained in Siemens' underlying license terms or other applicable agreements previously agreed to with Siemens (hereinafter "License Terms"). To the extent applicable to information, software or documentation made available in or through a Siemens Security Advisory, the Terms of Use of Siemens' Global Website (https://www.siemens.com/terms_of_use, hereinafter "Terms of Use"), in particular Sections 8-10 of the Terms of Use, shall apply additionally. In case of conflicts, the License Terms shall prevail over the Terms of Use.

Sources

• The advisory at cisa.gov
• The CSAF document (JSON)

DeSpy's copy of this version is dated 2026-09-28.