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CriticalCISA KEVExploited in the wildPublic exploit

Unauthenticated Command Injection in ZyXEL P660HN-T1A ViewLog.asp Remote System Log

IdentifiersCVE-2017-18368CWE-78· Improper Neutralization of Special…

CVE-2017-18368 is a command injection vulnerability in the ZyXEL P660HN-T1A v1 router running TCLinux firmware $7.3.15.0 v001 / 3.40(ULM.0)b31, as distributed by TrueOnline. The flaw is present in the Remote System Log forwarding functionality exposed through the ViewLog.asp page. An attacker can supply crafted input via the remote_host parameter, which is not safely handled before being used in a system command context, allowing arbitrary command execution on the device. The issue is explicitly described as reachable by an unauthenticated user.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows a remote, unauthenticated attacker to execute arbitrary OS commands on the affected router. This can result in full compromise of the device, including takeover of routing infrastructure, modification of configuration, deployment of malware or botnet payloads, persistence, traffic interception or redirection, and use of the device as a foothold for further attacks or DDoS activity.

Mitigation

If you can’t patch tonight, do this now.

Restrict access to the router’s web management interface so that ViewLog.asp is not exposed to the internet or untrusted network segments. Disable remote administration and, if operationally feasible, disable the Remote System Log forwarding feature until a fix is applied. Place management access behind VPN or trusted internal networks only, enforce network ACLs/firewall rules, and monitor the device for unexpected process execution, configuration changes, or outbound connections indicative of compromise.

Remediation

Patch, then assume compromise.

Upgrade to a fixed firmware release from the vendor or device distributor if one is available. If no patched firmware is available for the affected TrueOnline-distributed ZyXEL P660HN-T1A v1 firmware build, replace the device with supported hardware. Review and harden the Remote System Log feature configuration, and validate that any management interface exposing ViewLog.asp is no longer reachable by untrusted networks after remediation.
PUBLIC EXPLOITS

Exploits

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VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
Billion5200w-T Firmwareoperating_system
Zyxel CommunicationsP660hn-T1a V1 Firmwareoperating_system
Zyxel CommunicationsP660hn-T1a V2 Firmwareoperating_system

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

What this page doesn’t show

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Exposure mapping

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Threat actor evidence1

Every observed campaign linking this CVE to a named adversary.

Associated malware6

Malware families riding this exploit, with evidence and IOCs.

Detection signatures2

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity4

Community discussion across Reddit, Mastodon, and other social sources.