What is the CVSS score of CVE-2026-20764?

CVE-2026-20764 has a CVSS 3.1 base score of 8.0 (High). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of Xweb 500b Pro Firmware are affected by CVE-2026-20764?

A critical remote code execution vulnerability affects XWEB Pro versions 1.12.1 and earlier, allowing authenticated users to execute arbitrary commands on affected systems.

How to fix or mitigate CVE-2026-20764?

Within 24 hours: Inventory all XWEB Pro installations and their versions; restrict administrative access to affected systems to essential personnel only. Within 7 days: Implement network segmentation to isolate XWEB Pro systems; enable enhanced logging and monitoring for hostname configuration changes; evaluate upgrading to versions beyond 1.12.1 if available. Within 30 days: Complete migration to patched versions or alternative solutions; conduct forensic review of system logs for evidence of exploitation.

Xweb 500b Pro Firmware CVE-2026-20764

HIGH

OS Command Injection (CWE-78)

2026-02-27 ics-cert@hq.dhs.gov

RCE Command Injection Xweb 500b Pro Firmware Xweb 500d Pro Firmware Xweb 300d Pro Firmware

8.0

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

8.0 HIGH

AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

High

Privileges Required

High

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

CVE Published

Feb 27, 2026 - 02:16 nvd

HIGH 8.0

DescriptionCVE.org

An OS command injection vulnerability exists in XWEB Pro version 1.12.1 and prior, enabling an authenticated attacker to achieve remote code execution on the system by providing malicious input via the device hostname configuration which is later processed during system setup, resulting in remote code execution.

AnalysisAI

Authenticated attackers can execute arbitrary OS commands on Xweb Pro devices (versions 1.12.1 and earlier across 300d, 500b, and 500d models) by injecting malicious payloads into the hostname configuration parameter during system setup. This command injection vulnerability grants remote code execution with high privileges on affected systems. No patch is currently available, requiring organizations to implement network access controls or disable affected devices until remediation is released.

Technical ContextAI

Classified as CWE-78 (OS Command Injection). Affects Xweb 300D Pro Firmware. An OS command injection vulnerability exists in XWEB Pro version 1.12.1 and prior, enabling an authenticated attacker to achieve remote code execution on the system by providing malicious input via the device hostname configuration which is later processed during system setup, resulting in remote code execution.