CVE-2017-183715200w-T Firmware Hardcoded Credentials
The ZyXEL P660HN-T1A v2 TCLinux Fw #7.3.37.6 router distributed by TrueOnline has three user accounts with default passwords, including two hardcoded service accounts: one with the username true and password true, and another with the username supervisor and password zyad1234.
Published May 2, 2019 · Updated Nov 21, 2024
Key Facts
Patch immediately- CVE-2017-18371 is a critical-severity vulnerability (CVSS 9.8 v3) affecting 5200w-T Firmware (Billion), P660hn-T1a V1 Firmware (Zyxel), P660hn-T1a V2 Firmware (Zyxel).
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 23% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Scores
CVSS v3
9.8
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
23%
Higher than 97.6% of all scored CVEs
Exploit maturity
Weaponized
ATLAS score
63/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Weaponized
Public exploit code
1
Proof-of-concept links
In-the-wild evidence
3
Reports of active use
Advisories And Exploit References
Description
The ZyXEL P660HN-T1A v2 TCLinux Fw #7.3.37.6 router distributed by TrueOnline has three user accounts with default passwords, including two hardcoded service accounts: one with the username true and password true, and another with the username supervisor and password zyad1234. These accounts can be used to login to the web interface, exploit authenticated command injections, and change router settings for malicious purposes.
Affected Products
3 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| 5200w-T FirmwareBillion | 7.3.8.0 | n/a |
| P660hn-T1a V1 FirmwareZyxel | 7.3.37.6 | n/a |
| P660hn-T1a V2 FirmwareZyxel | 7.3.37.6 | n/a |
Timeline
Publicly disclosed
May 2, 2019
Last updated
Nov 21, 2024
Weakness Type
- CWE-798 Use of Hard-coded Credentials
References
- advisoryunit42.paloaltonetworks.com · new-mirai-variant-targets-enterprise-wireless-p…
- exploitMSF trueonline_p660hn_v2_rce.rb
- exploitraw.githubusercontent.com · zyxel_trueonline.txt
- exploitseclists.org · 40
- exploitssd-disclosure.com · 2910
FAQ
Common Questions.
The ZyXEL P660HN-T1A v2 TCLinux Fw #7.3.37.6 router distributed by TrueOnline has three user accounts with default passwords, including two hardcoded service accounts: one with the username true and password true, and another with the username supervisor and password zyad1234.
Affected: 5200w-T Firmware (Billion) versions 7.3.8.0; P660hn-T1a V1 Firmware (Zyxel) versions 7.3.37.6; P660hn-T1a V2 Firmware (Zyxel) versions 7.3.37.6. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Is CVE-2017-18371 On Your Attack Surface?
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