CVE-2021-27459

Name: CVE-2021-27459
Creator: NVD / NIST
Published: 2021-05-20T12:15:08.12+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.75%

Last modified Jun 17, 2026

CVE-2021-27459 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 1.75% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

1.75%

75.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-434

Affected Software

Vendor	Product	Versions
Emerson	X-Stream Enhanced Xegp Firmware	All versions
Emerson	X-Stream Enhanced Xegk Firmware	All versions
Emerson	X-Stream Enhanced Xefd Firmware	All versions
Emerson	X-Stream Enhanced Xexf Firmware	All versions

References

https://us-cert.cisa.gov/ics/advisories/icsa-21-138-01Third Party Advisory, US Government Resource
https://us-cert.cisa.gov/ics/advisories/icsa-21-138-01Third Party Advisory, US Government Resource

Timeline

Published: May 20, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-27459?

How severe is CVE-2021-27459?

CVE-2021-27459 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.75% probability of exploitation in the next 30 days.

How do I fix CVE-2021-27459?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-27459?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST