An incorrect authorization vulnerability in the Data Access Layer (DAL) of Zyxel EX3501-T0 firmware versions through 5.44(ACHR.6)C0 could a…

published 2026-10-20 20d ago modified 2026-11-04 6d ago also EUVD-2026-104789

cvss: 6.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 21%
public exploits: 0; none known

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.

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CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 19d ago (2026-10-21)

Exploit prediction

0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected products

Zyxel EX3501-T0 firmware

Classification

Weakness

CWE-863 Incorrect Authorization

References

zyxel.com /global/en/support/security-advisories/zyxel-security-advisory-for-incorrect-authorization-vulnerability-in-th
vendor-advisory

Sources

CVE List CVE-2026-12489
NVD CVE-2026-12489

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