CVE-2019-15804

HIGH

7.5

CVSS Score

Published: November 14, 2019 at 08:15 PM UTC

Updated: June 17, 2026 at 02:21 AM UTC

18 products affected across 1 vendorGS1900-10HP firmwareGS1900-24 firmwareGS1900-8 Firmware

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Severity

HIGH7.5

Exploit prediction

EPSS 0.9%

Description

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. By sending a signal to the CLI process, undocumented functionality is triggered. Specifically, a menu can be triggered by sending the SIGQUIT signal to the CLI application (e.g., through CTRL+\ via SSH). The access control check for this menu does work and prohibits accessing the menu, which contains "Password recovery for specific user" options. The menu is believed to be accessible using a serial console.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

GS1900-10HP firmware · Zyxel

95%

v < 2.50(aazi.0)c0

Affected range stops below 2.50(aazi.0)c0, so it looks safe — our inference, not a vendor statement

zyxel-gs1900-10hp (same device)

GS1900-16 firmware · Zyxel

95%

v < 2.50(aahj.0)c0

Affected range stops below 2.50(aahj.0)c0, so it looks safe — our inference, not a vendor statement

zyxel-gs1900-16 (same device)

GS1900-24 firmware · Zyxel

95%

v < 2.50(aahl.0)c0

Affected range stops below 2.50(aahl.0)c0, so it looks safe — our inference, not a vendor statement

zyxel-gs1900-24 (same device)

GS1900-24E firmware · Zyxel

95%

v < 2.50(aahk.0)c0

Affected range stops below 2.50(aahk.0)c0, so it looks safe — our inference, not a vendor statement

zyxel-gs1900-24e (same device)

Gs1900-24hp Firmware · Zyxel

95%

v < 2.50(aahm.0)c0

Affected range stops below 2.50(aahm.0)c0, so it looks safe — our inference, not a vendor statement

zyxel-gs1900-24hp (same device)

GS1900-48 firmware · Zyxel

95%

v < 2.50(aahn.0)c0

Affected range stops below 2.50(aahn.0)c0, so it looks safe — our inference, not a vendor statement

zyxel-gs1900-48 (same device)

Gs1900-48hp Firmware · Zyxel

95%

v < 2.50(aaho.0)c0

Affected range stops below 2.50(aaho.0)c0, so it looks safe — our inference, not a vendor statement

zyxel-gs1900-48hp (same device)

GS1900-8 Firmware · Zyxel

95%

v < 2.50(aahh.0)c0

Affected range stops below 2.50(aahh.0)c0, so it looks safe — our inference, not a vendor statement

zyxel-gs1900-8 (same device)

GS1900-8HP firmware · Zyxel

95%

v < 2.50(aahi.0)c0

Affected range stops below 2.50(aahi.0)c0, so it looks safe — our inference, not a vendor statement

zyxel-gs1900-8hp (same device)

Gs1900-10Hp · Zyxeldevice

80%

All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://www.zyxel.com/support/gs1900-switch-vulnerabilities.shtml

References (2)

x_refsource_MISCExploitThird Party Advisory

Source: [email protected]

https://jasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.html

x_refsource_CONFIRMVendor Advisory

Source: [email protected]

https://www.zyxel.com/support/gs1900-switch-vulnerabilities.shtml

CVSS

7.5HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: HIGH
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

NVD-CWE-noinfo

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