CVE-2017-18374
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (5.50%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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
- 8.8 HIGHCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 5.50% probability · 93th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-798
- Affected
- billion/5200w-t firmware · zyxel/p660hn-t1a v2 firmware · zyxel/p660hn-t1a v1 firmware
- Source
- cve@mitre.org
EPSS 5.5% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.zyxel.com/support/announcement_unauthenticated.shtmlBroken Link
- https://raw.githubusercontent.com/pedrib/PoC/master/advisories/zyxel_trueonline.txtExploit, Third Party Advisory
- https://seclists.org/fulldisclosure/2017/Jan/40Exploit, Mailing List, Third Party Advisory
- https://ssd-disclosure.com/index.php/archives/2910Exploit, Technical Description, Third Party Advisory
- https://unit42.paloaltonetworks.com/new-mirai-variant-targets-enterprise-wireless-presentation-display-systems/Technical Description, Third Party Advisory
- http://www.zyxel.com/support/announcement_unauthenticated.shtmlBroken Link
- https://raw.githubusercontent.com/pedrib/PoC/master/advisories/zyxel_trueonline.txtExploit, Third Party Advisory
- https://seclists.org/fulldisclosure/2017/Jan/40Exploit, Mailing List, Third Party Advisory
- https://ssd-disclosure.com/index.php/archives/2910Exploit, Technical Description, Third Party Advisory
- https://unit42.paloaltonetworks.com/new-mirai-variant-targets-enterprise-wireless-presentation-display-systems/Technical Description, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.