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CVE-2026-12489

MEDIUM
6.5
CVSS Score
Published: October 20, 2026 at 02:04 AM UTC
Updated: October 21, 2026 at 04:18 AM UTC
1 product affected across 1 vendorEx3501-t0 Firmware

Using EX3501-T0 firmware by Zyxel?

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

An incorrect authorization vulnerability in the Data Access Layer (DAL) of Zyxel EX3501-T0 firmware versions through 5.44(ACHR.6)C0 could allow an authenticated attacker to escalate privileges by modifying the login_privilege data on an affected device.

Affected

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

Ex3501-t0 Firmware· Zyxel
80%
<= 5.44(ACHR.6)C0

References (1)

Vendor Advisory
Source: cverecord
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-incorrect-authorization-vulnerability-in-the-dal-of-certain-5g-nr-cpe-dsl-ethernet-cpe-fiber-onts-and-wireless-extenders-10-20-2026

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUMZyxel
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-863

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