PatchTheCVECVE-2017-18374: The ZyXEL P660HN-T1A v1 TCLinux Fw $7.3.15.0 v001 / 3.40(ULM.0)b31 router distributed by TrueOnline has two us
CVE-2017-18374 is a high-severity flaw (CVSS 8.8) affecting 5200w-t firmware, p660hn-t1a v2 firmware, p660hn-t1a v1 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- High severity
- EPSS top 7%: very likely to be exploited
- Public exploit reference
- On your watchlist
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 8.8 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 5.5% (top 7%) |
| CISA exploited list | No |
| Weakness | CWE-798 |
| Published | 2019-05-02 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2017-18374?
5200w-t firmware: mitigate or apply the listed mitigation; p660hn-t1a v2 firmware: mitigate or apply the listed mitigation; p660hn-t1a v1 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2017-18374 being exploited?
CVE-2017-18374 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2017-18374 affect?
CVE-2017-18374 affects 5200w-t firmware, p660hn-t1a v2 firmware, p660hn-t1a v1 firmware. Severity is 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 accounts with default passwords, including a hardcoded service account with the username true and password true. These accounts
How urgent is CVE-2017-18374?
Priority 64/100. High severity; EPSS top 7%: very likely to be exploited; Public exploit reference; On your watchlist
Software pages
Related CVEs
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