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Fencer Intel
critical 9.8

CVE-2017-18371 in the critical feed json

The ZyXEL P660HN-T1A v2 TCLinux Fw #7.3.37.6 router distributed by TrueOnline has three user accounts with default passwords, including two…

published 7y ago modified 4mo ago also EUVD-2017-9487

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
22.5%
EPSS 22.5% chance of exploitation in 30 days, percentile 97%
public exploits
1
Metasploit

Summary

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.

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Timeline

  1. First public exploit (Metasploit exploit/linux/http/trueonline_p660hn_v2_rce)
  2. Published

Exploit prediction

22.53% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • Metasploit exploit/linux/http/trueonline_p660hn_v2_rce TrueOnline / ZyXEL P660HN-T v2 Router Authenticated Command Injection metasploit exploit, excellent rank, 2016-12-26
  • seclists.org https://seclists.org/fulldisclosure/2017/Jan/40 referenced PoC, tagged "exploit" by a source, unverified
  • ssd-disclosure.com https://ssd-disclosure.com/index.php/archives/2910 referenced PoC, tagged "exploit" by a source, unverified
  • raw.githubusercontent.com https://raw.githubusercontent.com/pedrib/PoC/master/advisories/zyxel_trueonline.txt referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-798 Use of Hard-coded Credentials

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.