CVE-2017-18368

CVE-2017-18368 is a critical-severity vulnerability in Billion 5200w-t Firmware with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2023-08-07). The underlying weakness is classified as CWE-78.

Key facts

• Severity: Critical (CVSS 3.x base score 9.8)
• CVSS v2: 10.0
• EPSS exploit prediction: 95% (100th percentile)
• Actively exploited: Yes — listed in CISA KEV (added 2023-08-07)
• EU (EUVD) id: EUVD-2017-9484
• EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2023-08-07)
• Weakness: CWE-78
• Affected product: Billion 5200w-t Firmware
• Published: 2019-05-02
• Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2017-18368?

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.

How severe is CVE-2017-18368?

CVE-2017-18368 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-18368 being actively exploited?

Yes. CVE-2017-18368 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2023-08-07, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2017-18368?

CVE-2017-18368 primarily affects Billion 5200w-t Firmware. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-18368?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2017-18368 have an EU (EUVD) identifier?

Yes. CVE-2017-18368 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2017-9484. It is also flagged as exploited in the EUVD (since 2023-08-07).

When was CVE-2017-18368 published?

CVE-2017-18368 was published on 2019-05-02 and last updated on 2026-06-17.

References

• http://www.zyxel.com/support/announcement_unauthenticated.shtml
• https://raw.githubusercontent.com/pedrib/PoC/master/advisories/zyxel_trueonline.txt
• https://seclists.org/fulldisclosure/2017/Jan/40
• https://ssd-disclosure.com/index.php/archives/2910
• https://unit42.paloaltonetworks.com/new-mirai-variant-targets-enterprise-wireless-presentation-display-systems/
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-18368

Affected products (3)

• cpe:2.3:o:billion:5200w-t_firmware:7.3.8.0:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p660hn-t1a_v2_firmware:7.3.15.0:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p660hn-t1a_v1_firmware:7.3.15.0:*:*:*:*:*:*:*

More vulnerabilities in Billion 5200w-t Firmware

• CVE-2017-18371 — Critical (CVSS 9.8): The ZyXEL P660HN-T1A v2 TCLinux Fw #7.3.37.6 router distributed by TrueOnline has three user accounts with default…
• CVE-2017-18369 — Critical (CVSS 9.8): The Billion 5200W-T 1.02b.rc5.dt49 router distributed by TrueOnline has a command injection vulnerability in the Remote…
• CVE-2017-18374 — High (CVSS 8.8): The ZyXEL P660HN-T1A v1 TCLinux Fw $7.3.15.0 v001 / 3.40(ULM.0)b31 router distributed by TrueOnline has two user…
• CVE-2017-18373 — High (CVSS 8.8): The Billion 5200W-T TCLinux Fw $7.3.8.0 v008 130603 router distributed by TrueOnline has three user accounts with…
• CVE-2017-18372 — High (CVSS 8.8): The Billion 5200W-T TCLinux Fw $7.3.8.0 v008 130603 router distributed by TrueOnline has a command injection…
• CVE-2017-18370 — High (CVSS 8.8): The ZyXEL P660HN-T1A v2 TCLinux Fw #7.3.37.6 router distributed by TrueOnline has a command injection vulnerability in…

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