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
Published May 2, 2019
8.8
HIGHCVSS 3.0
EPSS 5.50%
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.
Affected products
No data.
Configuration 1
- 7.3.8.0
Configuration 2
- 7.3.15.0
Running on/with
- n/a
Configuration 3
- 7.3.15.0
Running on/with
- n/a
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AV:N/AC:L/Au:S/C:C/I:C/A:C
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (15 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 5.50% (0.05503) | 92.54th | v5 (v2026.06.15) |
| Jun 15, 2026 | 5.50% (0.05503) | 91.75th | v5 (v2026.06.15) |
| Apr 2, 2026 | 5.17% (0.05171) | 89.86th | v4 (v2025.03.14) |
| Mar 17, 2025 | 7.35% (0.07348) | 91.04th | v4 (v2025.03.14) |
| Jul 20, 2024 | 1.46% (0.01455) | 86.82th | v3 (v2023.03.01) |
| Apr 10, 2024 | 1.45% (0.01452) | 86.44th | v3 (v2023.03.01) |
| Apr 5, 2024 | 1.03% (0.01028) | 83.53th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.03% (0.01028) | 81.53th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.20% (0.02204) | 81.15th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.20% (0.02204) | 79.34th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.20% (0.02204) | 58.01th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.32% (0.01324) | 31.25th | v1 |
| Jan 6, 2022 | 1.32% (0.01324) | 30.61th | v1 |
| Sep 1, 2021 | 1.32% (0.01324) | 69.73th | v1 |
| Apr 14, 2021 | 1.32% (0.01324) | 0.00th | v1 |
References (5)
- http://www.zyxel.com/support/announcement_unauthenticated.shtml x_refsource_MISCBroken Link
- https://raw.githubusercontent.com/pedrib/PoC/master/advisories/zyxel_trueonline.txt x_refsource_MISCExploitThird Party Advisory
- https://seclists.org/fulldisclosure/2017/Jan/40 x_refsource_MISCExploitMailing ListThird Party Advisory
- https://ssd-disclosure.com/index.php/archives/2910 x_refsource_MISCExploitTechnical DescriptionThird Party Advisory
- https://unit42.paloaltonetworks.com/new-mirai-variant-targets-enterprise-wireless-presentation-display-systems/ x_refsource_MISCTechnical DescriptionThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.zyxel.com/support/announcement_unauthenticated.shtml | x_refsource_MISCBroken Link | |
| https://raw.githubusercontent.com/pedrib/PoC/master/advisories/zyxel_trueonline.txt | x_refsource_MISCExploitThird Party Advisory | |
| https://seclists.org/fulldisclosure/2017/Jan/40 | x_refsource_MISCExploitMailing ListThird Party Advisory | |
| https://ssd-disclosure.com/index.php/archives/2910 | x_refsource_MISCExploitTechnical DescriptionThird Party Advisory | |
| https://unit42.paloaltonetworks.com/new-mirai-variant-targets-enterprise-wireless-presentation-display-systems/ | x_refsource_MISCTechnical DescriptionThird Party Advisory |
Change history (0)
No recorded changes yet.