Vulnerability report

Active exploitation observed Confirmed confidence In CISA KEV

CVE-2017-18368

P660HN-T1A v1 TCLinux Fw Command Injection

ZyXEL / P660HN-T1A v1 TCLinux Fw

Watch CVE-2017-18368 Browse KEV feed
Severity
CVSS 9.8 · Critical
Confidence
Confirmed
Exploit status
Observed in sensors
EPSS
94.4%
First observed
09 Jun 2026
Last observed
13 Oct 2026

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2017-18368 is an unauthenticated vulnerability affecting ZyXEL P660HN-T1A v1 TCLinux Fw. 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...

Is it exploited?

Yes. Previdian sensors observed exploitation attempts with confirmed confidence. Listed in CISA KEV. Also confirmed by third-party sources.

Who is affected?

ZyXEL / P660HN-T1A v1 TCLinux Fw.

What should we do?

Patch immediately, validate internet-facing exposure, and monitor for matching requests.

Overview

P660HN-T1A v1 TCLinux Fw Command Injection

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.

Published
02 May 2019
Exploitation Reported
07 Aug 2023
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

metasploit edge linux cisa

CVE References

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CISA

Recorded 07 Aug 2023

A trusted third party reported exploitation.

Active exploitation observed

Previdian sensor

First observed 09 Jun 2026

Previdian first observed exploitation attempts targeting this vulnerability in our honeypot sensors.

Proof of concept available

Recorded 28 Apr 2025

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

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Source Added
CISA First 2023-08-07 00:00 UTC
The Shadowserver 2026-06-01 00:00 UTC
Previdian Sensors 2026-06-09 16:18 UTC

Operational indicators for this CVE are listed under Detection.

Sensor telemetry

First-party evidence of exploitation activity

Previdian sensors recorded exploitation attempts targeting this vulnerability. The cards and chart show volume, unique attackers, and daily activity.

205

Attempts observed

27

Unique attacker IPs

15

Attacker countries

AR · BR · CA · CH · CN · FI · FR · IN · KR · MK · TH · TW · US · VN · ZA

8

Sensors observed

CVE-2017-18368 exploitation attempts over the last 91 days

Daily events observed by Previdian sensors

Updated 17 Oct 2026

5
5
7
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6
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6
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4
4
8
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3
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5
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2
2
6
6
5
8
1
3
1
0
1
1
3
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0
1
0
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1
0
2
1
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1
0
0
2
1
0
0
0
1
1
0
1
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0
1
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1
0
1
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0
0
0
0
19 Jul 7 Aug 26 Aug 14 Sep 17 Oct

First observed 09 Jun 2026 · Last observed 13 Oct 2026

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Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
1
3
6

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Virtual patch status

Previdian virtual patch guidance is available for this CVE.

AWS WAF Cloudflare ModSecurity

Attacker IP Indicators

Attacker IP indicators observed · available in Pro and Enterprise.

Sensor-derived attacker IP indicators are available to Pro and Enterprise accounts under Detection and through the Pro API.

Learn about Pro API access

Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner Reference Detected
Metasploit https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/linux/http/trueonline_p660hn_v1_rce.rb 28 Apr 2025

Virtual Patch Detail

Compensating WAF rules for this CVE.

Available

Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to Previdian Enterprise users.

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Risk and context

Severity, weaknesses, and research context

CVSS v3.1

9.8 Critical

Potential damage if exploited. Separate from whether attackers are using it.

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

EPSS

94.4%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') CWE-78

All CVSS Scores

CVSS v3.1 9.8 Critical

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

CVSS v2.0 10.0 High

AV:N/AC:L/Au:N/C:C/I:C/A:C

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

trueonline_p660hn_v1_rce

metasploit · Created Unknown

Metasploit module for CVE-2017-18368

Timeline

From disclosure to observed exploitation

  1. 14:21 UTC

    Virtual patch available

    Compensating WAF rule available to block exploitation

  2. 16:18 UTC

    Indicators of compromise added (69)

    Indicators of compromise recorded

  3. 16:18 UTC

    Observed by Previdian sensors

    Evidence-backed exploitation signal

  4. 00:00 UTC

    KEV confirmed by The Shadowserver

    Exploitation attested by an external source

  5. 15:02 UTC

    Metasploit module available

    Exploit module available

  6. 15:02 UTC

    Public PoC available

    Public proof-of-concept code published

  7. 00:00 UTC

    Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  8. 16:14 UTC

    CVE published

    Vulnerability disclosed publicly

  9. 00:00 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2017-18368

Sample API response 
{
  "cve_id": "CVE-2017-18368",
  "confidence": "Confirmed",
  "cvss_score": 9.8,
  "cvss_estimated": false,
  "epss_score": 0.94425,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": true
  },
  "sensor_telemetry": { "attempts": 205, "sensors": 8 }
}