CVE-2026-36538

Severity CVSS v4.0:

Pending analysis

Type:

CWE-798 Use of Hard-coded Credentials

Publication date:

27/05/2026

Last modified:

28/05/2026

Description

Netis AC1200 Router NC21 V4.0.1.4296 contains a hard-coded root credential stored in /etc/shadow.sample. The password for the root account is set to the trivially weak value root, allowing an attacker with access to the device to authenticate as root and gain full control of the underlying operating system.

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L CVSS v3.1 Severity and Metrics:

Base Score: 7.30 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): Low
Integrity (I): Low
Availability (A): Low

Base Score 3.x

7.30

Severity 3.x

HIGH

References to Advisories, Solutions, and Tools

http://netis-system.com
https://github.com/sir3ns/cve-disclosure/blob/main/CVE-2026-36538/readme.md
https://github.com/sir3ns/cve-disclosure/blob/main/CVE-2026-36538/readme.md