Overview
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.
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-a-new-variant-of-gafgyt-malware; https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-command-injection-vulnerability-in-p660hn-t1a-dsl-cpe; https://nvd.nist.gov/vuln/detail/CVE-2017-18368
Key Details
| Property | Value |
|---|---|
| CVE ID | CVE-2017-18368 |
| Vendor / Product | Zyxel — P660HN-T1A Routers |
| NVD Published | 2019-05-02 |
| NVD Last Modified | 2025-11-05 |
| CVSS 3.1 Score | 9.8 |
| CVSS 3.1 Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| Severity | CRITICAL |
| CWE | CWE-78 |
| CISA KEV Added | 2023-08-07 |
| CISA KEV Deadline | 2023-08-28 |
| Known Ransomware Use | No |
CVSS 3.1 Breakdown
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Required Action
CISA BOD 22-01 Deadline: 2023-08-28.
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Timeline
| Date | Event |
|---|---|
| 2023-08-07 | Added to CISA Known Exploited Vulnerabilities catalog |
| 2023-08-28 | CISA BOD 22-01 remediation deadline |
References
| Resource | Type |
|---|---|
| NVD — CVE-2017-18368 | Vulnerability Database |
| CISA KEV Catalog Entry | US Government |