CVE-2017-18368
Critical 9.8 Exploited in the wild (KEV)
Confirmed active exploitation — CISA KEV catalog
- Name
- Zyxel P660HN-T1A Routers Command Injection Vulnerability
- Added to catalog
- Remediation due date (US federal)
- Required action
- Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Description
The ZyXEL P660HN-T1A v1 TCLinux Fw $7.3.15.0 v001 / 3.40(ULM.0)b31 router distributed by TrueOnline has a command injection vulnerability in the Remote System Log forwarding function, which is accessible by an unauthenticated user. The vulnerability is in the ViewLog.asp page and can be exploited through the remote_host parameter.
Metrics
- CVSS 3.1
-
9.8 (CRITICAL)
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 95% (percentile: 100) as of 2 November 2026
- CWE
- CWE-78
Affected products
billion: 5200w-t firmware; billion: 5200w-t; zyxel: p660hn-t1a v2 firmware; zyxel: p660hn-t1a v2; zyxel: p660hn-t1a v1 firmware; zyxel: p660hn-t1a v1
References
- https://raw.githubusercontent.com/pedrib/PoC/master/advisories/zyxel_trueonline… 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://raw.githubusercontent.com/pedrib/PoC/master/advisories/zyxel_trueonline… 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
- http://www.zyxel.com/support/announcement_unauthenticated.shtml Broken Link
- https://unit42.paloaltonetworks.com/new-mirai-variant-targets-enterprise-wirele… Technical DescriptionThird Party Advisory
- http://www.zyxel.com/support/announcement_unauthenticated.shtml Broken Link
- https://unit42.paloaltonetworks.com/new-mirai-variant-targets-enterprise-wirele… Technical DescriptionThird Party Advisory