CVE-2017-20204DBLTek GoIP Telnet Admin Interface Undocumented Backdoor
Updated under an hour ago ()
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It affects DBL Technology (DBLTek) GoIP. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 9.3 CRITICAL (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- Weakness (CWE)
- CWE-1242
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Oct 15, 2025
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
DBL Technology (DBLTek) GoIP dbl_technology_dbltek:goip (from the name) | all versions | CNA record |
References
- http://www.dbltek.com/product
- https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/undocumented-backdoor-account-in-dbltek-goip/technical-description, exploit
- https://github.com/JacobMisirian/DblTekGoIPPwnexploit
- https://www.vulncheck.com/advisories/dbltek-goip-telnet-admin-interface-undocumented-backdoorthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.