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CVE-2026-42373

D-Link DIR-605L Hardware Revision B2 (End-of-Life, EOL) contains a hardcoded telnet backdoor. The device starts a telnet daemon at boot via /bin/telnetd.sh with the username "Alphanetworks" and the static password "wrgn76_dlwbr_dir605L" read from /etc/alpha_config/image_sign. The custom telnetd binary accepts a -u user:password flag, and the custom login binary uses strcmp() to validate credentials. Successful authentication grants an unauthenticated attacker on the local network a root shell wi
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:39085fe9a99a5cfd408e60f11e268af2126e6e2f6a2bc564082ccc452cdd8950
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"cpes":["cpe:2.3:o:dlink:dir-605l_firmware:*:*:*:*:*:*:*:*"],"defaultStatus":"affected","platforms":["MIPS32 Big-Endian"],"product":"DIR-605L Firmware","vendor":"D-Link","versions":[{"status":"affected","version":"B2","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:43f5bd8327c0646b4d7474ea4053ff9e30e7aae59ec3ba917e4f0d7e51e5c613 · sha256:e6ed0f7093648dc3… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.8,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:43f5bd8327c0646b4d7474ea4053ff9e30e7aae59ec3ba917e4f0d7e51e5c613 · sha256:e6ed0f7093648dc3… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-798","description":"CWE-798 Use of Hard-coded Credentials","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:43f5bd8327c0646b4d7474ea4053ff9e30e7aae59ec3ba917e4f0d7e51e5c613 · sha256:e6ed0f7093648dc3… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"D-Link DIR-605L B2 Hardcoded Telnet Backdoor - Securin Advisory","url":"https://www.securin.io/zero-day/cve-2026-42373-hardcoded-telnet-backdoor-in-d-link-dir-605l-b2-end-of-life-"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:43f5bd8327c0646b4d7474ea4053ff9e30e7aae59ec3ba917e4f0d7e51e5c613 · sha256:e6ed0f7093648dc3… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://www.securin.io/zero-day/cve-2026-42373-hardcoded-telnet-backdoor-in-d-link-dir-605l-b2-end-of-life-"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:43f5bd8327c0646b4d7474ea4053ff9e30e7aae59ec3ba917e4f0d7e51e5c613 · sha256:e6ed0f7093648dc3… · /containers/adp/0/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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