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No exploitation reportedFix available

CVE-2019-15801

No exploitation reported by the sources we read.

  • Published2019-11-14
  • Fixed in2.50\(aazi.0\)c0
  • WeaknessCWE-798

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2019-11-1421:15CVE publishedNVD

Versions per branch

NVD
Zyxel gs1900-10hp firmwareversion to verify
BranchAffectedFixed in
2.50< 2.50\(aazi.0\)c02.50\(aazi.0\)c0
Zyxel gs1900-16 firmwareversion to verify
BranchAffectedFixed in
2.50< 2.50\(aahj.0\)c02.50\(aahj.0\)c0
Zyxel gs1900-24 firmwareversion to verify
BranchAffectedFixed in
2.50< 2.50\(aahl.0\)c02.50\(aahl.0\)c0

6 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Zyxel gs1900-10hp firmware to 2.50\(aazi.0\)c0

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
2019-11-14
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-g22q-gmqw-xvw4

Frequently asked questions

What is CVE-2019-15801?

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.

Is CVE-2019-15801 actively exploited?

Active exploitation of CVE-2019-15801 has not been confirmed. Its EPSS score was 1.5% on 2026-11-13, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-15801?

CVE-2019-15801 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

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Sources for this record