CVE-2020-25752Public exploitNetwork attack vector

Privileged web access via calculable hard-coded passwords

Published Jun 16, 2021 · Updated Aug 4, 2024

Hard-coded credentials in Enphase Envoy R3.x and D4.x allow remote attackers to access privileged web-panel accounts via calculable passwords. The pam_emu authentication module deterministically derives each account password from an MD5 hash of the public serial number, username, and static strings. Unauthenticated access to /info.xml exposes the serial number, so network reachability is enough to calculate reusable installer and Enphase credentials that users cannot change.

CVSS severity5.3
Medium
EPSS probability1.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Hard-coded credentials in Enphase Envoy R3.x and D4.x allow remote attackers to access privileged web-panel accounts via calculable passwords. The pam_emu authentication module deterministically derives each account password from an MD5 hash of the public serial number, username, and static strings. Unauthenticated access to /info.xml exposes the serial number, so network reachability is enough to calculate reusable installer and Enphase credentials that users cannot change.

The record

CVE
CVE-2020-25752
Published
Jun 16, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-798, T1078.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 16, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-798Use of Hard-coded Credentials
T1078.001Default Accounts

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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