What is CVE-2023-3935?

CVE-2023-3935 is a critical-severity vulnerability in Phoenixcontact Activation Wizard, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2023-09-13.

How severe is CVE-2023-3935?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Phoenixcontact Activation Wizard

CVE-2023-3935

A heap buffer overflow vulnerability in Wibu CodeMeter Runtime network service up to version 7.60b allows an unauthenticated, remote attacker to achieve RCE and gain full access of the host system.

Vulnerability class: Buffer Overflow

Published 2023-09-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.020 (79.6th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 79.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.020 · newest: 0.020 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

cdn.wibu.com/fileadmin/wibu_downloads/security_advisories/AdvisoryWIBU-230704-0… (Vendor Advisory)
cert.vde.com/en/advisories/VDE-2023-031/ (Third Party Advisory)
cert.vde.com/en/advisories/VDE-2023-030/ (Third Party Advisory)

Frequently asked questions

What is CVE-2023-3935?: CVE-2023-3935 is a critical-severity vulnerability in Phoenixcontact Activation Wizard, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2023-09-13.
How severe is CVE-2023-3935?: Critical severity. CVSS v3 base score is 9.8 out of 10.