CVE-2019-15802

MEDIUM
5.9
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
MEDIUM5.9
Exploit prediction
EPSS 2%

Description

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. The firmware hashes and encrypts passwords using a hardcoded cryptographic key in sal_util_str_encrypt() in libsal.so.0.0. The parameters (salt, IV, and key data) are used to encrypt and decrypt all passwords using AES256 in CBC mode. With the parameters known, all previously encrypted passwords can be decrypted. This includes the passwords that are part of configuration backups or otherwise embedded as part of the firmware.

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:

CVSS

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

Quick Info

StatusMODIFIED
CWE
CWE-798

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