CVE-2017-18374 json
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 pass…
published 2019-05-02 7 y ago modified 2026-06-17 4 mo ago also EUVD-2017-9490
- cvss
- 8.8
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 5.5%
- EPSS 5.5% chance of exploitation in 30 days, percentile 92%
- public exploits
- 0
- none known
Summary
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.
Exploit prediction
5.50% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- 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 | 8.8 | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 9.0 | AV:N/AC:L/Au:S/C:C/I:C/A:C |
Classification
- Weakness
-
- CWE-798 Use of Hard-coded Credentials
References
-
seclists.org
/fulldisclosure/2017/Jan/40
exploit, mailing-list, third-party-advisory
-
ssd-disclosure.com
/index.php/archives/2910
exploit, technical-description, third-party-advisory
-
raw.githubusercontent.com
/pedrib/PoC/master/advisories/zyxel_trueonline.txt
exploit, third-party-advisory
-
unit42.paloaltonetworks.com
/new-mirai-variant-targets-enterprise-wireless-presentation-display-systems/
technical-description, third-party-advisory
-
zyxel.com
/support/announcement_unauthenticated.shtml
broken-link
Sources
- CVE List CVE-2017-18374
- NVD CVE-2017-18374
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.