CVE-2025-67114Public exploitNetwork attack vector

Authentication bypass via MAC-derived administrative credentials

Published Mar 19, 2026 · Updated Mar 19, 2026

Weak credentials in Sercomm SCE4255W firmware before DG3934v3@2308041842 allow remote attackers to gain root access from a device MAC address. The /ftl/bin/calc_f2 binary combines the eth0 MAC with hard-coded role keys, hashes the result, and deterministically selects each password's characters. Knowledge of the MAC is sufficient to reproduce root, Telnet, administrative, and debug credentials offline and authenticate with full device privileges.

CVSS severity9.8
Critical
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak credentials in Sercomm SCE4255W firmware before DG3934v3@2308041842 allow remote attackers to gain root access from a device MAC address. The /ftl/bin/calc_f2 binary combines the eth0 MAC with hard-coded role keys, hashes the result, and deterministically selects each password's characters. Knowledge of the MAC is sufficient to reproduce root, Telnet, administrative, and debug credentials offline and authenticate with full device privileges.

The record

CVE
CVE-2025-67114
Published
Mar 19, 2026
Updated
Mar 19, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-1391, T1078
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 19, 2026Record 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

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1391Use of Weak Credentials
T1078Valid 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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