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CVE-2017-18374

30
FAUCET Score

CVE-2017-18374 describes a critical vulnerability in the ZyXEL P660HN-T1A v1 TCLinux Fw $7.3.15.0 v001 / 3.40(ULM.0)b31 router, distributed by TrueOnline, due to hardcoded default credentials for two user accounts, including a service account with username "true" and password "true". This vulnerability carries a high CVSS score of 8.8, indicating that an unauthenticated attacker can remotely log into the web interface, execute arbitrary commands, and alter router settings, leading to full compromise of the device. While no public exploit code or active exploitation has been observed, the presence of hardcoded credentials makes this a straightforward and impactful vulnerability, though it has received minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
7.3.8.0CPE matchmatch criteria
cpe:2.3:o:billion:5200w-t_firmware:7.3.8.0:*:*:*:*:*:*:*
7.3.15.0CPE matchmatch criteria
cpe:2.3:o:zyxel:p660hn-t1a_v2_firmware:7.3.15.0:*:*:*:*:*:*:*
7.3.15.0CPE matchmatch criteria
cpe:2.3:o:zyxel:p660hn-t1a_v1_firmware:7.3.15.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

8.8HIGH

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
5.50%
Probability of exploitation in next 30 days
EPSS Percentile
92.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0550 is in the 91st percentile among its peer group of 17,822 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

raw.githubusercontent.com / pedrib/PoC/master/advisories/zyxel_trueonline.txt
ExploitThird Party Advisory
seclists.org / fulldisclosure/2017/Jan/40
ExploitMailing ListThird Party Advisory
ssd-disclosure.com / index.php/archives/2910
ExploitTechnical DescriptionThird Party Advisory
unit42.paloaltonetworks.com / new-mirai-variant-targets-enterprise-wireless-presentation-display-systems
Technical DescriptionThird Party Advisory
zyxel.com / support/announcement_unauthenticated.shtml
Broken Link