CVE-2017-18368

KEVZyxel P660HN-T1A Routers Command Injection Vulnerability

Description

Zyxel P660HN-T1A routers contain a command injection vulnerability in the Remote System Log forwarding function, which is accessible by an unauthenticated user and exploited via the remote_host parameter of the ViewLog.asp page.

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.

CVSS 3.1 vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

PublishedMay 2, 2019

Last modifiedJun 17, 2026

Added to KEVAug 7, 2023

Remediation dueAug 28, 2023

References

zyxel.com/support/announcement_unauthenticated.shtmlBroken Link
raw.githubusercontent.com/pedrib/PoC/master/advisories/zyxel_trueonline.txtExploitThird Party Advisory
seclists.org/fulldisclosure/2017/Jan/40ExploitMailing List
ssd-disclosure.com/index.php/archives/2910ExploitTechnical Description
unit42.paloaltonetworks.com/new-mirai-variant-targets-enterprise-wireless-presentation-display-systems/Technical DescriptionThird Party Advisory
cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-18368US Government Resource

0 recent articles mention this CVE

Risk assessment · Critical

Actively exploited. Patch immediately.

Exploitation: Confirmed in the wild (CISA KEV)
Federal remediation deadline: Overdue by 1156 days
CVSS: 9.8 CRITICAL
EPSS (30-day exploit probability): 94.5% · top 1% of all CVEs
Weakness: CWE-78
Attack vector: Network, remotely reachable
Preconditions: No privileges and no user interaction

Recommended actions

1.Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
2.Treat as emergency change: patch or isolate internet-facing instances first.
3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.

Assessment is derived automatically from the live signals above; verify against your own asset inventory.