A vulnerability has been found in multiple revisions of Emerson Rosemount X-STREAM Gas Analyzer.

published 2021-05-20 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-14217

cvss: 5.3; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.9%; EPSS 0.9% chance of exploitation in 30 days, percentile 59%
public exploits: 0; none known

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.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-21-138-01 updated 2021-05-18 cvss 5.3

ICSA-21-138-01_Emerson Rosemount X-STREAM

Emerson X-STREAM enhanced XEFD Emerson X-STREAM enhanced XEGK Emerson X-STREAM enhanced XEGP Emerson X-STREAM enhanced XEXF
affected: mitigation “One of the cybersecurity best practices should include configuring web browsers to prohibit storage of user information such as login names and passwords.” emerson.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

0.90% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

n/a Emerson Rosemount X-STREAM Gas Analyzer

Classification

Weakness

CWE-539 Use of Persistent Cookies Containing Sensitive Information

References

us-cert.cisa.gov /ics/advisories/icsa-21-138-01
third-party-advisory, us-government-resource

Sources

CVE List CVE-2021-27463
NVD CVE-2021-27463

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary