CVE-2021-27463: Emerson X-Stream Enhanced Xefd Firmware

Medium severity, CVSS 5.3. EPSS: 0.9% chance of exploitation in the next 30 days.

A vulnerability has been found in multiple revisions of Emerson Rosemount X-STREAM Gas Analyzer. The affected applications utilize persistent cookies where the session cookie attribute is not properly invalidated, allowing an attacker to intercept the cookies and gain access to sensitive information.

Affected products

• Emerson X-Stream Enhanced Xefd Firmware: any version
• Emerson X-Stream Enhanced Xegk Firmware: any version
• Emerson X-Stream Enhanced Xegp Firmware: any version
• Emerson X-Stream Enhanced Xexf Firmware: any version

Published 2021-05-20. Last modified 2026-06-17.