Description
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.
References (3)
Core 3
Core References
Product, Vendor Advisory x_refsource_misc
https://enphase.com/en-us/products-and-services/envoy-and-combiner
Third Party Advisory x_refsource_misc
https://stage2sec.com
Exploit, Third Party Advisory x_refsource_misc
https://medium.com/stage-2-security/can-solar-controllers-be-used-to-generate-fake-clean-energy-credits-4a7322e7661a
Scores
CVSS v3
7.5
EPSS
0.0134
EPSS Percentile
67.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Details
CWE
CWE-916
Status
published
Products (2)
enphase/envoy_firmware
d4.0
enphase/envoy_firmware
r3.0
Published
Jun 16, 2021
Tracked Since
Feb 18, 2026