CVE-2019-15799

HIGH
8.8
CVSS Score
Published: November 14, 2019 at 08:16 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
HIGH8.8
Exploit prediction
EPSS 2%

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.

Affected

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

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)
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)
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)
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)
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)
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)
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)
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)
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)
All versions

Remediation

No guide yet

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

References (3)

x_refsource_MISCExploitThird Party Advisory
https://vimeo.com/354726424

CVSS

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

Quick Info

StatusMODIFIED
CWE
CWE-269

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