{"answers":{"affected":"","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2017-20204 exists.","fix":"No fix has been published for CVE-2017-20204 yet. Limit exposure of the affected software until one is available.","what":"CVE-2017-20204 is a critical authentication bypass vulnerability in DBL Technology (DBLTek) GoIP, published on 15 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2017-20204 and fix it if it is affected.\n\nWhat it is: CVE-2017-20204 is a critical authentication bypass vulnerability in DBL Technology (DBLTek) GoIP, published on 15 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2017-20204 exists.\n\nAffected product: DBL Technology (DBLTek) GoIP. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2017-20204/ (Markdown: https://insights.sbomify.com/CVE-2017-20204/index.md)","id":"CVE-2017-20204","markdown":"https://insights.sbomify.com/CVE-2017-20204/index.md","name":"CVE-2017-20204","record":{"aliases":["GHSA-5g7c-29rx-62p8"],"analysis":{"component_type":"iot_embedded","fix_type":"no_fix_stated","impacts":["code_execution","privilege_escalation"],"network_reachable":"yes","non_default_config":false,"product_category":"GoIP VoIP gateway","requires_auth":"none","summary":"Remote attackers can bypass authentication on DBLTek GoIP devices via a flawed Telnet backdoor to gain root access and execute arbitrary code.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":9.3,"severity":"critical","source":"cna","vector":"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","version":"4.0"},"cwes":[{"id":"CWE-1242","name":"Inclusion of Undocumented Features or Chicken Bits"}],"description":"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.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":null,"headline":"DBLTek GoIP Telnet Admin Interface Undocumented Backdoor","id":"CVE-2017-20204","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"auth_bypass","year":"2017"},"n_packages":0,"n_references":4,"next":{"headline":"Valve Source SDK Stack-Based Buffer Overflow RCE","id":"CVE-2017-20205"},"packages":[],"prev":{"headline":"NetSarang v5.0 Malicious Backdoor Supply Chain Compromise","id":"CVE-2017-20203"},"products":["GoIP"],"published":"2025-10-15","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"poc","technical_impact":"total"},"state":"PUBLISHED","updated":"2025-10-15","vendors":["DBL Technology (DBLTek)"]},"summary":"Remote attackers can bypass authentication on DBLTek GoIP devices via a flawed Telnet backdoor to gain root access and execute arbitrary code.","url":"https://insights.sbomify.com/CVE-2017-20204/"}