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Fencer Vulns
critical 9.8

CVE-2021-27459 json

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-2021-14213

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.8%
EPSS 1.8% chance of exploitation in 30 days, percentile 78%
public exploits
0
none known

Summary

A vulnerability has been found in multiple revisions of Emerson Rosemount X-STREAM Gas Analyzer. The webserver of the affected products allows unvalidated files to be uploaded, which an attacker could utilize to execute arbitrary code.

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 cvss 7.1

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

1.75% chance of exploitation in the next 30 days, higher than 78% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • n/a Emerson Rosemount X-STREAM Gas Analyzer

Classification

Weakness
  • CWE-434 Unrestricted Upload of File with Dangerous Type

References

Sources

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.