CVE intelligence and bounded remediation

CVE-2021-39613 — Dlink Dvg-3104Ms Firmware security vulnerability

Critical CVSS 9.8

D-Link DVG-3104MS version 1.0.2.0.3, 1.0.2.0.4, and 1.0.2.0.4E contains hard-coded credentials for undocumented user accounts in the '/etc/passwd' file. As weak passwords have been used, the plaintext passwords can be recovered from the hash values. NOTE: This vulnerability only affects products that are no longer supported by the maintainer

Severity
Critical
CVSS
9.8 (3.1)
Published
2021-08-23
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-798

Affected products

  • dlink / dvg-3104ms_firmware / 1.0.2.0.3
  • dlink / dvg-3104ms_firmware / 1.0.2.0.4
  • dlink / dvg-3104ms_firmware / 1.0.2.0.4e

Matched remediation archetype

Authentication bypass and missing authentication

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Check exposure

  • Map every affected endpoint and protocol path, including alternate ports, legacy routes, recovery flows, service accounts, and machine-to-machine access.
  • Confirm which deployments enable the affected authentication mode and whether the interface is reachable from untrusted networks.
  • Review session, token, credential, and proxy trust configuration without attempting account takeover.

Remediate safely

  • Apply the supported fix and centralize fail-closed authentication before protected request handling.
  • Remove default or embedded credentials, rotate affected secrets and sessions, and bind authentication decisions to the intended audience and channel.
  • Add negative tests for alternate routes, malformed or absent credentials, recovery flows, and proxy-derived identity.

Authoritative sources

Complete CVE record and remediation plan

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