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 1.49%
Description
An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. The firmware image contains encrypted passwords that are used to authenticate users wishing to access a diagnostics or password-recovery menu. Using the hardcoded cryptographic key found elsewhere in the firmware, these passwords can be decrypted. This is related to fds_sys_passDebugPasswd_ret() and fds_sys_passRecoveryPasswd_ret() in libfds.so.0.0.
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:H/I:N/A:N
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:P/I:N/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 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 3, 2026 | 1.49% (0.01486) | 73.13th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.49% (0.01486) | 70.56th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.29% (0.00286) | 50.08th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.26% (0.00264) | 66.55th | v3 (v2023.03.01) |
| Apr 18, 2024 | 0.26% (0.00264) | 65.74th | v3 (v2023.03.01) |
| Oct 21, 2023 | 0.26% (0.00264) | 63.72th | v3 (v2023.03.01) |
| Mar 19, 2023 | 0.29% (0.00293) | 64.32th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.32% (0.00324) | 66.02th | v3 (v2023.03.01) |
| Mar 6, 2023 | 9.03% (0.09029) | 94.14th | v2 (v2022.01.01) |
| Apr 1, 2022 | 9.03% (0.09029) | 93.60th | v2 (v2022.01.01) |
| Feb 4, 2022 | 9.03% (0.09029) | 86.86th | v2 (v2022.01.01) |
| Feb 3, 2022 | 2.74% (0.02742) | 63.06th | v1 |
| Jan 6, 2022 | 2.74% (0.02742) | 62.72th | v1 |
| Sep 1, 2021 | 2.74% (0.02742) | 80.38th | v1 |
| Apr 14, 2021 | 2.74% (0.02742) | 0.00th | v1 |
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.