CVE-2017-18368Known exploitationPublic exploitNetwork attack vector

Unauthenticated root execution via syslog host injection

Published May 2, 2019 · Updated Oct 21, 2025

Command injection in Zyxel Networks P-660HN-T1A ViewLog.asp allows remote attackers to run root commands via crafted HTTP requests. On hardware revision v1 with TrueOnline firmware 3.40(ULM.0)b31, the Remote System Log forwarder interprets shell metacharacters in remote_host as commands rather than only a log-server address. Exploitation requires access to the management interface but no credentials; LAN exploitation is demonstrated, while WAN reachability was not established.

CVSS severity9.8
Critical
EPSS probability94.51%
Next 30 days · Nov 1, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in Zyxel Networks P-660HN-T1A ViewLog.asp allows remote attackers to run root commands via crafted HTTP requests. On hardware revision v1 with TrueOnline firmware 3.40(ULM.0)b31, the Remote System Log forwarder interprets shell metacharacters in remote_host as commands rather than only a log-server address. Exploitation requires access to the management interface but no credentials; LAN exploitation is demonstrated, while WAN reachability was not established.

The record

CVE
CVE-2017-18368
Published
May 2, 2019
Updated
Oct 21, 2025
Vendor
Zyxel Networks
Product
Zyxel P-660HN-T1A
Classifications
CWE-78, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 2, 2019CVE publishedPublication date reported by the CVE source.
  2. Oct 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=n/a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Zyxel Networks · Zyxel P-660HN-T1Aversion=n/a

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsShadowserver observations through Sep 28, 2026. Gaps indicate unavailable data.
Sep 22, 2026Sep 28, 2026
View daily counts
Reporting dayUnique IPs
Sep 22, 20265
Sep 23, 20263
Sep 24, 20264
Sep 25, 20265
Sep 26, 20267
Sep 27, 20265
Sep 28, 20266
Latest reporting daySep 28, 2026
Latest daily unique IPs6
Prior 30-day average4
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059.004Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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