HOMEVULNERABILITIESCVE-2017-18374
HIGH

CVE-2017-18374

CWE-798Published: May 2, 2019· Updated: Jun 17, 2026

8.8
CVSS v3.1

Official Description

The ZyXEL P660HN-T1A v1 TCLinux Fw $7.3.15.0 v001 / 3.40(ULM.0)b31 router distributed by TrueOnline has two user accounts with default passwords, including a hardcoded service account with the username true and password true. These accounts can be used to login to the web interface, exploit authenticated command injections and change router settings for malicious purposes.

NVD Source

Technical Analysis

CVE-2017-18374 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

billion2 product(s)
5200w-t firmware5200w-t
zyxel4 product(s)
p660hn-t1a v2 firmwarep660hn-t1a v2p660hn-t1a v1 firmwarep660hn-t1a v1
Source: NVD CPE · 6 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://raw.githubusercontent.com/pedrib/PoC/master/advisories/zyxel_trueonline.txt
ADVISORYhttps://seclists.org/fulldisclosure/2017/Jan/40
ADVISORYhttps://ssd-disclosure.com/index.php/archives/2910
ADVISORYhttps://unit42.paloaltonetworks.com/new-mirai-variant-targets-enterprise-wireless-presentation-display-systems/
ADVISORYhttps://raw.githubusercontent.com/pedrib/PoC/master/advisories/zyxel_trueonline.txt
ADVISORYhttps://seclists.org/fulldisclosure/2017/Jan/40
ADVISORYhttps://ssd-disclosure.com/index.php/archives/2910
ADVISORYhttps://unit42.paloaltonetworks.com/new-mirai-variant-targets-enterprise-wireless-presentation-display-systems/

All References (10)

→
http://www.zyxel.com/support/announcement_unauthenticated.shtmlBroken Link
→
https://raw.githubusercontent.com/pedrib/PoC/master/advisories/zyxel_trueonline.txtExploit · Third Party Advisory
→
https://seclists.org/fulldisclosure/2017/Jan/40Exploit · Mailing List · Third Party Advisory
→
https://ssd-disclosure.com/index.php/archives/2910Exploit · Technical Description · Third Party Advisory
→
https://unit42.paloaltonetworks.com/new-mirai-variant-targets-enterprise-wireless-presentation-display-systems/Technical Description · Third Party Advisory
→
http://www.zyxel.com/support/announcement_unauthenticated.shtmlBroken Link
→
https://raw.githubusercontent.com/pedrib/PoC/master/advisories/zyxel_trueonline.txtExploit · Third Party Advisory
→
https://seclists.org/fulldisclosure/2017/Jan/40Exploit · Mailing List · Third Party Advisory
→
https://ssd-disclosure.com/index.php/archives/2910Exploit · Technical Description · Third Party Advisory
→
https://unit42.paloaltonetworks.com/new-mirai-variant-targets-enterprise-wireless-presentation-display-systems/Technical Description · Third Party Advisory

Quick Facts

CVE IDCVE-2017-18374
CVSS Score8.8 / 10
SeverityHIGH
WeaknessCWE-798
CISA KEVNo
Affected2 vendor(s)
PublishedMay 2, 2019

Related CVEs (CWE-798)

CVE-2021-40519
10.0
CVE-2020-6963
10.0
CVE-2012-6428
10.0
CVE-2018-5560
10.0
CVE-2021-40422
10.0
CVE-2023-1748
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2017-18374 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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