CVE-2017-20204

CRITICALNVD 9.39.3—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.3 under NVD CVSS v3. EPSS exploit probability: 1.2%, top 21% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
9.3
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.3Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

DBLTek GoIP devices (models GoIP 1, 4, 8, 16, and 32) contain an undocumented vendor backdoor in the Telnet administrative interface that allows remote authentication as an undocumented user via a proprietary challenge–response scheme which is fundamentally flawed. Because the challenge response can be computed from the challenge itself, a remote attacker can authenticate without knowledge of a secret and obtain a root shell on the device. This can lead to persistent remote code execution, full device compromise, and arbitrary control of the device and any managed services. The firmware used within these devices was updated in December 2016 to make this vulnerability more complex to exploit. However, it is unknown if DBLTek has taken steps to fully mitigate.

CVSS v3
9.3
EG Score
9.3(medium)
EPSS
53.9%
KEV
Not listed

Published

October 15, 2025

Last Modified

April 15, 2026

Advisory Details (3)

Auto-updated Jul 16, 2026
No patch confirmed yet.
generic

DBLTek GoIP Telnet Admin Interface Undocumented Backdoor | Advisories | VulnCheck

https://www.vulncheck.com/advisories/dbltek-goip-telnet-admin-interface-undocumented-backdoor
generic

GitHub - JacobMisirian/DblTekGoIPPwn: Tool to check if an IP of a DblTek GoIP is vulnerable to a challenge-response login system, send SMS messages from the system, execute remote commands botnet style, and generate responses to challenges. · GitHub

https://github.com/JacobMisirian/DblTekGoIPPwn
generic

GSM网关, SIM BANK, RolP网关, FXS网关 – 深圳市得伯乐科技有限公司

http://www.dbltek.com/

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 39× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-22 22:08 UTCEG score recompute
  2. 2026-07-22 14:04 UTCEPSS rescore
  3. 2026-07-22 14:04 UTCEPSS rescore
  4. 2026-07-21 15:21 UTCEPSS rescore
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  1. 2026-07-06 02:20 UTCEPSS rescore
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  28. 2026-06-14 23:14 UTCEPSS rescore
  29. 2026-06-13 22:57 UTCEPSS rescore
  30. 2026-06-12 23:09 UTCEPSS rescore
  31. 2026-06-10 22:15 UTCEPSS rescore
  32. 2026-06-10 13:19 UTCEPSS rescore
  33. 2026-06-08 15:23 UTCEG score recompute▲ 9.30
  34. 2026-06-08 15:23 UTCGHSA enrichment
  35. 2026-06-08 14:14 UTCEPSS rescore
  36. 2026-06-08 14:14 UTCEPSS rescore
  37. 2026-06-07 15:22 UTCEPSS rescore
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  39. 2026-06-06 13:45 UTCEPSS rescore
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  44. 2026-06-04 13:10 UTCEPSS rescore
  45. 2026-06-02 20:11 UTCEPSS rescore
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  48. 2026-05-31 22:28 UTCEPSS rescore
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  50. 2026-05-31 00:14 UTCEPSS rescore
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  66. 2026-05-21 22:40 UTCEPSS rescore
  67. 2026-05-21 06:31 UTCEG score recompute
  68. 2026-05-21 06:31 UTCGHSA enrichment
  69. 2026-05-20 22:37 UTCEPSS rescore
  70. 2026-05-20 22:37 UTCEPSS rescore
  71. 2026-05-20 22:37 UTCEPSS rescore
  72. 2026-05-20 11:21 UTCEPSS rescore
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  74. 2026-05-18 21:30 UTCEPSS rescore

Frequently asked(5)

What is CVE-2017-20204?
CVE-2017-20204 is a critical vulnerability published on October 15, 2025. DBLTek GoIP devices (models GoIP 1, 4, 8, 16, and 32) contain an undocumented vendor backdoor in the Telnet administrative interface that allows remote authentication as an undocumented user via a proprietary challenge–response scheme which is fundamentally flawed. Because the challenge response…
When was CVE-2017-20204 disclosed?
CVE-2017-20204 was first published in the National Vulnerability Database on October 15, 2025, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-20204 actively exploited?
CVE-2017-20204 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 53.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2017-20204?
CVE-2017-20204 has a CVSS v3 base score of 9.3 (NVD).
How do I remediate CVE-2017-20204?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-20204, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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