CVE intelligence and bounded remediation

CVE-2019-18852 — Dlink Dir-600 B1 Firmware security vulnerability

Critical CVSS 9.8

Certain D-Link devices have a hardcoded Alphanetworks user account with TELNET access because of /etc/config/image_sign or /etc/alpha_config/image_sign. This affects DIR-600 B1 V2.01 for WW, DIR-890L A1 v1.03, DIR-615 J1 v100 (for DCN), DIR-645 A1 v1.03, DIR-815 A1 v1.01, DIR-823 A1 v1.01, and DIR-842 C1 v3.00.

Severity
Critical
CVSS
9.8 (3.1)
Published
2019-11-11
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-319

Affected products

  • dlink / dir-600_b1_firmware / 2.01
  • dlink / dir-615_j1_firmware / 100
  • dlink / dir-645_a1_firmware / 1.03
  • dlink / dir-815_a1_firmware / 1.01
  • dlink / dir-823_a1_firmware / 1.01
  • dlink / dir-842_c1_firmware / 3.00

Showing 6 representative product identities from 7 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Cryptography, certificate, signature, and channel validation

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Inventory affected algorithms, key uses, trust stores, certificate validation settings, random sources, and plaintext channels across clients and services.
  • Determine which secrets, identities, signatures, or data protections depend on the affected primitive or validation path.
  • Check debug, compatibility, fallback, and hostname or audience override settings in build and runtime configuration.

Remediate safely

  • Use a maintained platform cryptographic API with approved algorithms, modes, parameters, randomness, and full peer identity validation.
  • Remove insecure fallback and validation bypasses; separate keys by purpose and load them from managed secret storage.
  • Plan rotation or reissuance for affected keys, certificates, tokens, hashes, or ciphertext and document compatibility sequencing.

Authoritative sources

Complete CVE record and remediation plan

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