Cyber Resilience

CVE-2017-18368

RCE in Billion 5200W-T Firmware 7.3.8.0

CISA KEVActive ExploitationEUVD ExploitedPublic PoCRCECommand Injection
Published
02 May 2019
Modified
05 November 2025
KEV Added
07 August 2023
CVSS Score v3.1 9.8
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.95 99.8th percentile
Risk Priority 97 floored blend · peak EPSS

Summary

CVE-2017-18368 is a critical-severity OS Command Injection (CWE-78) vulnerability in Billion 5200W-T Firmware. Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Command and Scripting Interpreter (T1059); ranked in the top 0.2% of CVEs by exploit likelihood; CISA has added it to the Known Exploited Vulnerabilities catalog; a public proof-of-concept is referenced.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

The vulnerability CVE-2017-18368 is a command injection flaw (CWE-78) in the ZyXEL P660HN-T1A v1 router running TCLinux firmware version 7.3.15.0 v001 / 3.40(ULM.0)b31 as distributed by TrueOnline. It resides in the Remote System Log forwarding function on the ViewLog.asp page and is triggered through the remote_host parameter, with no authentication required for access. The flaw received a CVSS 3.1 score of 9.8.

An unauthenticated attacker with network access can supply a malicious remote_host value to execute arbitrary operating system commands on the device. This grants complete control over the router, allowing impacts to confidentiality, integrity, and availability without any user interaction or privileges.

Public references include a ZyXEL announcement on unauthenticated vulnerabilities, a detailed proof-of-concept, and technical write-ups on Seclists and SSD Disclosure. One reference from Unit 42 links the issue to a Mirai variant observed targeting similar enterprise wireless and router devices.

OWASP Top 10 for Web (2025)

A05:2025 Injection

EU & UK References

Vulnerability Data

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…

more

and can be exploited through the remote_host parameter.

CWE(s)
CWE-78
KEV Date Added
07 August 2023

Related Threats

MITRE ATT&CK Enterprise Techniques

T1059 Command and Scripting Interpreter Execution
Adversaries may abuse command and script interpreters to execute commands, scripts, or binaries.
attack.mitre.org →
T1059.003 Windows Command Shell Execution
Adversaries may abuse the Windows command shell for execution.
attack.mitre.org →
T1059.004 Unix Shell Execution
Adversaries may abuse Unix shell commands and scripts for execution.
attack.mitre.org →
T1059.001 PowerShell Execution
Adversaries may abuse PowerShell commands and scripts for execution.
attack.mitre.org →
T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2024-40890Same vendor: Zyxelboth on KEV
CVE-2024-40891Same vendor: Zyxelboth on KEV
CVE-2022-30525Same vendor: Zyxelboth on KEV
CVE-2023-27992Same vendor: Zyxelboth on KEV
CVE-2020-9054Same vendor: Zyxelboth on KEV
CVE-2017-6884Same vendor: Zyxelboth on KEV
CVE-2023-28771Same vendor: Zyxelboth on KEV
CVE-2017-18369Same product: Billion 5200W-T
CVE-2023-39780Shared CWE-78both on KEV
CVE-2021-20035Shared CWE-78both on KEV

Affected Assets

billion
5200w-t firmware
7.3.8.0
zyxel
p660hn-t1a v2 firmware
7.3.15.0
zyxel
p660hn-t1a v1 firmware
7.3.15.0

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V1.2.5
  • V1.2.8
  • V15.2.5

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SC-27 Platform-independent Applications
addresses: CWE-78

Platform-independent apps typically execute inside a managed runtime or sandbox that restricts direct OS command execution, reducing the ability to exploit OS command injection.

SI-10 Information Input Validation
addresses: CWE-78

Validates inputs to block special elements that would alter OS command execution.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

PR.PS-06's SDLC practices directly require secure coding and input handling that blocks command-injection defects, yet the single broad outcome leaves many specific neutralization vectors and verification gaps unaddressed.

PR.PS-02 partial match
prevents

Routine patching/maintenance can remediate known command-injection CVEs in dependencies (partial forward) but does nothing to stop developers from introducing improper neutralization in custom code (none reverse).

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing and code review target insecure use of operating-system command interfaces, catching command-injection flaws introduced during development.

References