An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0
Published Nov 14, 2019
7.5
HIGHCVSS 3.1
EPSS 0.93%
Description
An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. By sending a signal to the CLI process, undocumented functionality is triggered. Specifically, a menu can be triggered by sending the SIGQUIT signal to the CLI application (e.g., through CTRL+\ via SSH). The access control check for this menu does work and prohibits accessing the menu, which contains "Password recovery for specific user" options. The menu is believed to be accessible using a serial console.
Affected products
No data.
Configuration 1
- < 2.50\(aahh.0\)c0
Configuration 2
- < 2.50\(aahi.0\)c0
Running on/with
- n/a
Configuration 3
- < 2.50\(aazi.0\)c0
Running on/with
- n/a
Configuration 4
- < 2.50\(aahj.0\)c0
Configuration 5
- < 2.50\(aahk.0\)c0
Running on/with
- n/a
Configuration 6
- < 2.50\(aahl.0\)c0
Configuration 7
- < 2.50\(aahm.0\)c0
Running on/with
- n/a
Configuration 8
- < 2.50\(aahn.0\)c0
Configuration 9
- < 2.50\(aaho.0\)c0
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:N/I:P/A:N
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 3, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (12 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 0.93% (0.00931) | 59.28th | v5 (v2026.06.15) |
| Sep 20, 2026 | 0.93% (0.00931) | 59.10th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.12% (0.00119) | 46.70th | v3 (v2023.03.01) |
| Jun 14, 2024 | 0.12% (0.00119) | 46.40th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.12% (0.00119) | 44.37th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.89% (0.00885) | 24.24th | v2 (v2022.01.01) |
| Feb 4, 2022 | 4.50% (0.04499) | 74.08th | v2 (v2022.01.01) |
| Feb 3, 2022 | 2.74% (0.02742) | 63.06th | v1 |
| Jan 6, 2022 | 2.74% (0.02742) | 62.72th | v1 |
| Jan 5, 2022 | 0.62% (0.00624) | 46.35th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.62% (0.00624) | 0.00th | v1 |
No CWE recorded.
References (2)
- https://jasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.html x_refsource_MISCExploitThird Party Advisory
- https://www.zyxel.com/support/gs1900-switch-vulnerabilities.shtml x_refsource_CONFIRMVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://jasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.html | x_refsource_MISCExploitThird Party Advisory | |
| https://www.zyxel.com/support/gs1900-switch-vulnerabilities.shtml | x_refsource_CONFIRMVendor Advisory |
Change history (0)
No recorded changes yet.