How severe is CVE-2017-18368?

CVE-2017-18368 has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which products are affected by CVE-2017-18368?

CVE-2017-18368 affects the following products: billion 5200w-t firmware, zyxel p660hn-t1a v1 firmware, zyxel p660hn-t1a v2 firmware.

How do I patch CVE-2017-18368?

No patch has shipped for CVE-2017-18368 yet — track the billion 5200w-t firmware advisory for a fixed release and apply the workarounds below in the meantime.

How do I detect CVE-2017-18368 across my infrastructure?

Inventory every billion 5200w-t firmware deployment and check each version against the affected-products list above. Because the exploit targets the running system rather than your application code, also watch for remote code execution at the network and runtime layer — O3 flags the exploit behaviour from runtime telemetry and egress traffic even before a vulnerable build is confirmed.

How do I mitigate CVE-2017-18368 if there is no patch (or I can't update yet)?

Cut exposure now: restrict the management/admin interface to trusted networks, segment the device, and apply the vendor's recommended configuration mitigations and any WAF/IPS signature. O3's runtime protection blocks the exploit chain at execution, holding the line on unpatched or end-of-life systems until you can patch.

How does O3 Security protect against CVE-2017-18368?

O3 detects and blocks CVE-2017-18368 exploitation at runtime: eBPF exploit-chain detection, plus L7 egress monitoring that catches the post-exploitation callback and severs the attacker's outbound channel.

Is CVE-2017-18368 actively exploited in the wild?

Yes. There are 7 known exploit references for CVE-2017-18368, including 7 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2017-18368?

CVE-2017-18368 has an EPSS (Exploit Prediction Scoring System) score of 94.4%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

What type of vulnerability is CVE-2017-18368?

CVE-2017-18368 is classified as OS Command Injection (CWE-78). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

Which products and versions are affected by CVE-2017-18368?

CVE-2017-18368 affects billion 5200w-t firmware (1 version, e.g. 7.3.8.0); zyxel p660hn-t1a v1 firmware (1 version, e.g. 7.3.15.0); zyxel p660hn-t1a v2 firmware (1 version, e.g. 7.3.15.0). Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2017-18368 published, and has it been updated?

CVE-2017-18368 was published on May 2, 2019 and was last updated on June 17, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🛡️

Not in CISA KEV

CRITICAL severity

CVE-2017-18368

CRITICAL

CVE-2017-18368 is a critical-severity (CVSS 9.8) OS Command Injection vulnerability in billion 5200w-t firmware. 7 public exploit references exist, so weaponization risk is real. O3 Security detects and blocks CVE-2017-18368 exploitation at runtime via eBPF exploit-chain detection and L7 egress monitoring, even on unpatched systems.

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,…

Published

May 2, 2019

Updated

Jun 17, 2026

Affected

3 products

Patched

See advisory

Exploits

7 known

Exploitation data as of Sep 5, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

Actively exploited in the wild

CISA’s SSVC triage classifies this CVE as under active exploitation.
CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
A successful exploit gives an attacker total control of the affected component, not partial access.

Exploitation and automatability from CISA’s SSVC triage for CVE-2017-18368.

EPSS Exploitation Probability

via FIRST.org ↗

94.4%probability of exploitation in next 30 days

Very High Risk0.00%

Lower risk than most CVEs100th percentile — riskier than 100% of all scored CVEsHighest risk

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

How urgent is this, really

CVE-2017-18368 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE sits: patch-first territory.

Where this sits among everything scored

Of 0 CVEs with a current EPSS score, this one falls in the ≥ 90% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.

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.

Affected Products

3 products · 3 configurations

5200w-t firmwarebillion

1 version

7.3.8.0

p660hn-t1a v1 firmwarezyxel

1 version

7.3.15.0

p660hn-t1a v2 firmwarezyxel

1 version

7.3.15.0

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.