CodeMeter Runtime EUVD-2026-66980

Exploitation requires CodeMeter Runtime to be deployed in server mode - client-only installations are not affected. The attacker must have network-level connectivity to the CodeMeter configuration command handler port on the target host; no authentication is required (PR:N per CVSS:3.1/AV:N). No user interaction is needed. The vulnerability is limited to the specific condition of server-mode operation: organizations that deploy CodeMeter solely as a local client library are not exposed. Exploitation is further constrained by whether the handler port is accessible from untrusted network segments - internet-exposed CodeMeter servers represent the highest-risk deployment posture.

The CVSS 8.6 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L) accurately reflects the threat profile: the vulnerability is network-reachable, requires no authentication, and has low attack complexity once a server-mode instance is reachable. The high integrity impact (I:H) is the dominant risk signal - credential hash overwrite enables WebAdmin takeover, not merely data disclosure. The primary real-world limiting factor is that exploitation requires CodeMeter to be configured in server mode and for the configuration handler port to be reachable from the attacker, which is not the default for all deployments but is standard in centralized licensing environments. No EPSS score, KEV listing, or POC data was provided in the source intelligence, so exploit maturity cannot be assessed; exploitation probability must be treated as elevated given the trivial attack complexity (AC:L, PR:N) and the availability of the vendor advisory which may guide researcher interest. The C:L rating may understate practical impact, since reading the WebAdmin credential hash is a stepping stone to full administrative control.

An attacker who can reach the CodeMeter configuration handler port over the network sends unauthenticated configuration commands to read Server.ini contents, extracting the WebAdmin credential hash. The attacker either cracks the hash offline or overwrites it with a hash of a known password, then authenticates to the CodeMeter WebAdmin interface with full administrative privileges. No exploit code has been publicly identified at time of analysis, but the attack requires only standard network tooling and knowledge of the CodeMeter protocol.