An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. User accounts created through the web interface of…

Description

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. User accounts created through the web interface of the device, when given non-admin level privileges, have the same level of privileged access as administrators when connecting to the device via SSH (while their permissions via the web interface are in fact restricted). This allows normal users to obtain the administrative password by running the tech-support command via the CLI: this contains the encrypted passwords for all users on the device. As these passwords are encrypted using well-known and static parameters, they can be decrypted and the original passwords (including the administrator password) can be obtained.

Scores

EPSS (exploitation in 30 days)

2.3% · top 17% of all CVEs (6 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.8.

Weakness

• n/a
• CWE-269 (opens in a new tab)All about CWE-269 and its CVEs

Affected products

• n/a

  • affected n/a

References (3)

• https://jasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.html (opens in a new tab)x_refsource_MISCx_transferred
• https://vimeo.com/354726424 (opens in a new tab)x_refsource_MISCx_transferred
• https://www.zyxel.com/support/gs1900-switch-vulnerabilities.shtml (opens in a new tab)x_refsource_CONFIRMx_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2019-15799](https://trackcve.app/badge/CVE-2019-15799.svg)](https://trackcve.app/cve/CVE-2019-15799)

Record last updated 5 Aug 2024, 00:56 UTC.