CVE-2019-15801

Name: CVE-2019-15801
Creator: NVD / NIST
Published: 2019-11-14T21:15:11.75+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.49%

Last modified Jun 17, 2026

CVE-2019-15801 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 1.49% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

1.49%

70.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-798

Affected Software

Vendor	Product	Versions
Zyxel	Gs1900-8 Firmware	< 2.50\(aahh.0\)c0
Zyxel	Gs1900-8hp Firmware	< 2.50\(aahi.0\)c0
Zyxel	Gs1900-10hp Firmware	< 2.50\(aazi.0\)c0
Zyxel	Gs1900-16 Firmware	< 2.50\(aahj.0\)c0
Zyxel	Gs1900-24e Firmware	< 2.50\(aahk.0\)c0
Zyxel	Gs1900-24 Firmware	< 2.50\(aahl.0\)c0
Zyxel	Gs1900-24hp Firmware	< 2.50\(aahm.0\)c0
Zyxel	Gs1900-48 Firmware	< 2.50\(aahn.0\)c0
Zyxel	Gs1900-48hp Firmware	< 2.50\(aaho.0\)c0

References

https://jasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.htmlExploit, Third Party Advisory
https://www.zyxel.com/support/gs1900-switch-vulnerabilities.shtmlVendor Advisory
https://jasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.htmlExploit, Third Party Advisory
https://www.zyxel.com/support/gs1900-switch-vulnerabilities.shtmlVendor Advisory

Timeline

Published: Nov 14, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-15801?

How severe is CVE-2019-15801?

CVE-2019-15801 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.49% probability of exploitation in the next 30 days.

How do I fix CVE-2019-15801?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-15801?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST