CVE-2017-18368
CriticalExploitedPublic exploitThe 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.
Published May 2, 2019 · Updated Nov 5, 2025
Key Facts
Patch immediately- CVE-2017-18368 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting 5200w-T Firmware (Billion), P660hn-T1a V1 Firmware (Zyxel), P660hn-T1a V2 Firmware (Zyxel).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Nov 11, 2021. Public exploit code is available.
- EPSS estimates a 94% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
94%
Higher than 99.8% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
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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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Aug 7, 2023 | Aug 28, 2023 | Not reported |
| Industry KEV feed | Nov 11, 2021 | Aug 28, 2023 | Not reported |
| CIRCL KEV | Aug 7, 2023 | Aug 28, 2023 | Not reported |
| ENISA EUVD | Aug 7, 2023 | n/a | Not reported |
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Affected Products
3 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| 5200w-T FirmwareBillion | 7.3.8.0 | n/a |
| P660hn-T1a V1 FirmwareZyxel | 7.3.15.0 | n/a |
| P660hn-T1a V2 FirmwareZyxel | 7.3.15.0 | n/a |
Timeline
Publicly disclosed
May 2, 2019
Added to Industry KEV feed
Nov 11, 2021
Added to CISA KEV
Aug 7, 2023
Added to CIRCL KEV
Aug 7, 2023
Added to ENISA EUVD
Aug 7, 2023
Last updated
Nov 5, 2025
Weakness Type
- CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
References
- advisoryhttps://unit42.paloaltonetworks.com/new-mirai-variant-targets-enterprise-wireless-presentation-display-systems/
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
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.
Affected: 5200w-T Firmware (Billion) versions 7.3.8.0; P660hn-T1a V1 Firmware (Zyxel) versions 7.3.15.0; P660hn-T1a V2 Firmware (Zyxel) versions 7.3.15.0. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Nov 11, 2021.
Yes. It was added on Aug 7, 2023 with a federal remediation due date of Aug 28, 2023.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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