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Vulnerability record · CVE-2017-18374 · published 2 May 2019

CVE-2017-18374: Billion 5200w-t firmware hard-coded credentials vulnerability

Billion · 5200w T Firmware

The ZyXEL P660HN-T1A v1 TCLinux Fw $7.3.15.0 v001 / 3.40(ULM.0)b31 router distributed by TrueOnline has two user accounts with default passwords, including a hardcoded service account with the username true and password true. These accounts can be used to login to the web interface, exploit authenticated command injections and change router settings for malicious purposes.

8.8 CVSS 3.0 High EPSS 5.5% · top 7.5% CWE-798 · Hard-coded credentials
8.8CVSS 3.0 base score, v2 9.0
5.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
10References, 6 tagged exploit
17 Jun 2026Last modified by NVD

Description

The ZyXEL P660HN-T1A v1 TCLinux Fw $7.3.15.0 v001 / 3.40(ULM.0)b31 router distributed by TrueOnline has two user accounts with default passwords, including a hardcoded service account with the username true and password true. These accounts can be used to login to the web interface, exploit authenticated command injections and change router settings for malicious purposes.

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.zyxel.com/support/announcement_unauthenticated.shtml Broken Link
https://raw.githubusercontent.com/pedrib/PoC/master/advisories/zyxel_trueonline.txt ExploitThird Party Advisory
https://seclists.org/fulldisclosure/2017/Jan/40 ExploitMailing ListThird Party Advisory
https://ssd-disclosure.com/index.php/archives/2910 ExploitTechnical DescriptionThird Party Advisory
https://unit42.paloaltonetworks.com/new-mirai-variant-targets-enterprise-wireless-presentation-display-systems/ Technical DescriptionThird Party Advisory
http://www.zyxel.com/support/announcement_unauthenticated.shtml Broken Link
https://raw.githubusercontent.com/pedrib/PoC/master/advisories/zyxel_trueonline.txt ExploitThird Party Advisory
https://seclists.org/fulldisclosure/2017/Jan/40 ExploitMailing ListThird Party Advisory
https://ssd-disclosure.com/index.php/archives/2910 ExploitTechnical DescriptionThird Party Advisory
https://unit42.paloaltonetworks.com/new-mirai-variant-targets-enterprise-wireless-presentation-display-systems/ Technical DescriptionThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2017-18368ZyXEL P660HN-T1A Router Remote System Log Command InjectionThe ZyXEL P660HN-T1A v1 router (TCLinux Fw 7.3.15.0 v001 / 3.40(ULM.0)b31, distributed by TrueOnline) contains an OS command injection flaw in the Re…KEVEPSS 94%analysed9.8CVE-2017-18371Billion 5200w-t firmware hard-coded credentials vulnerabilityThe ZyXEL P660HN-T1A v2 TCLinux Fw #7.3.37.6 router distributed by TrueOnline has three user accounts with default passwords, including two hardcoded…EPSS 23%9.8CVE-2017-18369Billion 5200W-T router command injection in Remote System Log forwardingThe Billion 5200W-T 1.02b.rc5.dt49 router, distributed by TrueOnline, contains an OS command injection flaw in the Remote System Log forwarding funct…EPSS 68%analysed8.8CVE-2017-18372Billion 5200w-t firmware os command injection vulnerabilityThe Billion 5200W-T TCLinux Fw $7.3.8.0 v008 130603 router distributed by TrueOnline has a command injection vulnerability in the Time Setting functi…EPSS 22%8.8CVE-2017-18373Billion 5200w-t firmware hard-coded credentials vulnerabilityThe Billion 5200W-T TCLinux Fw $7.3.8.0 v008 130603 router distributed by TrueOnline has three user accounts with default passwords, including two ha…EPSS 5.4%8.8CVE-2017-18370Billion 5200w-t firmware os command injection vulnerabilityThe ZyXEL P660HN-T1A v2 TCLinux Fw #7.3.37.6 router distributed by TrueOnline has a command injection vulnerability in the Remote System Log forwardi…EPSS 24%10.0CVE-2026-22769Dell RecoverPoint for Virtual Machines hardcoded credential flawDell RecoverPoint for Virtual Machines versions prior to 6.0.3.1 HF1 contain a hardcoded credential vulnerability (CWE-798). An unauthenticated remot…KEVEPSS 13%analysed7.1CVE-2025-14611Gladinet CentreStack and Triofox hardcoded AES key enables file inclusionCentreStack and Triofox before 16.12.10420.56791 use hardcoded values in their AES cryptoscheme, weakening protection for publicly exposed endpoints.…KEVEPSS 53%analysed

Source: NIST National Vulnerability Database (record CVE-2017-18374), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.