An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0
Published Nov 14, 2019
5.9
MEDIUMCVSS 3.1
EPSS 1.50%
Description
An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. The firmware hashes and encrypts passwords using a hardcoded cryptographic key in sal_util_str_encrypt() in libsal.so.0.0. The parameters (salt, IV, and key data) are used to encrypt and decrypt all passwords using AES256 in CBC mode. With the parameters known, all previously encrypted passwords can be decrypted. This includes the passwords that are part of configuration backups or otherwise embedded as part of the firmware.
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:H/PR:N/UI:N/S:U/C:H/I:N/A:N
No CVSS v3.0 score for this CVE.
AV:N/AC:M/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 2, 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 (14 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 1.50% (0.01500) | 73.37th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.50% (0.01500) | 70.85th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.29% (0.00286) | 50.08th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.26% (0.00261) | 66.38th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.26% (0.00261) | 64.88th | v3 (v2023.03.01) |
| Mar 19, 2023 | 0.26% (0.00261) | 62.10th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.29% (0.00289) | 64.00th | 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.