CVE-2020-25754: Enphase Envoy Firmware

High severity, CVSS 7.5. EPSS: 1.4% chance of exploitation in the next 30 days.

An issue was discovered on Enphase Envoy R3.x and D4.x devices. There is a custom PAM module for user authentication that circumvents traditional user authentication. This module uses a password derived from the MD5 hash of the username and serial number. The serial number can be retrieved by an unauthenticated user at /info.xml. Attempts to change the user password via passwd or other tools have no effect.

Affected products

• Enphase Envoy Firmware: version d4.0 only; version r3.0 only

Published 2021-06-16. Last modified 2026-06-17.