CVE-2021-27461Network attack vector

Unauthenticated file disclosure via crafted URL traversal

Published May 20, 2021 · Updated Aug 3, 2024

Path traversal in Emerson Rosemount X-STREAM Enhanced gas analyzers of all revisions allows remote attackers to read stored data. The embedded web server fails to restrict crafted URL paths to their intended directory, exposing files stored on the analyzer. No authentication or user interaction is required; the demonstrated consequence is data disclosure without modification or service interruption.

CVSS severity7.5
High
EPSS probability1.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Emerson Rosemount X-STREAM Enhanced gas analyzers of all revisions allows remote attackers to read stored data. The embedded web server fails to restrict crafted URL paths to their intended directory, exposing files stored on the analyzer. No authentication or user interaction is required; the demonstrated consequence is data disclosure without modification or service interruption.

The record

CVE
CVE-2021-27461
Published
May 20, 2021
Updated
Aug 3, 2024
Vendor
Emerson Electric Co.
Product
Rosemount X-STREAM Enhanced Continuous Gas Analyzers
Classifications
CWE-22, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 20, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=X-STREAM enhanced XEGP – all revisions, X-STREAM enhanced XEGK – all revisions, X-STREAM enhanced XEFD – all revisions, X-

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Emerson Electric Co. · Rosemount X-STREAM Enhanced Continuous Gas Analyzersversion=X-STREAM enhanced XEGP – all revisions, X-STREAM enhanced XEGK – all revisions, X-STREAM enhanced XEFD – all revisions, X-

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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