CVE-2020-28899

CRITICAL
9.1
CVSS Score
Published: March 16, 2021 at 04:17 PM UTC
Updated: June 17, 2026 at 03:10 AM UTC
6 products affected across 1 vendorLte7460-m608 FirmwareWAH7706 FirmwareLte4506-m606 Firmware

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Severity
CRITICAL9.1
Exploit prediction
EPSS 2%

Description

The Web CGI Script on ZyXEL LTE4506-M606 V1.00(ABDO.2)C0 devices does not require authentication, which allows remote unauthenticated attackers (via crafted JSON action data to /cgi-bin/gui.cgi) to use all features provided by the router. Examples: change the router password, retrieve the Wi-Fi passphrase, send an SMS message, or modify the IP forwarding to access the internal network.

Affected

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

v < v1.00(abdo.6)c0
Affected range stops below v1.00(abdo.6)c0, so it looks safe — our inference, not a vendor statement
zyxel-lte4506-m606 (same device)
v < v1.00(abfr.5)c0
Affected range stops below v1.00(abfr.5)c0, so it looks safe — our inference, not a vendor statement
zyxel-lte7460-m608 (same device)
v < v1.00(abbc.11)c0
Affected range stops below v1.00(abbc.11)c0, so it looks safe — our inference, not a vendor statement
zyxel-wah7706 (same device)
All versions
All versions
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
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-306

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