No exploitation reported

CVE-2021-27463

No exploitation reported by the sources we read.

Published2021-05-20
WeaknessCWE-539

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC

2021-05-2012:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-27463?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-27463?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Emerson x-stream enhanced xefd firmwareversion to verify

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

Emerson x-stream enhanced xegk firmwareversion to verify

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

Emerson x-stream enhanced xegp firmwareversion to verify

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

1 more product in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-21-138-01 CISA4 known affected
ICSA-21-138-01_Emerson Rosemount X-STREAM
X-STREAM enhanced XEGP: all revisions · X-STREAM enhanced XEGK: all revisions · X-STREAM enhanced XEXF: all revisions · +1 more

Full record on NVD

Fix

Mitigation from the vendor CISA ICSA-21-138-01 · 4 productsEmerson recommends users update the firmware of the affected products. A new release that addresses the issues identified in this cybersecurity notification impacting the affected products is available. For information on how to obtain the update, contact TechSupport.Hasselroth@emerson.com
Mitigation from the vendor CISA ICSA-21-138-01 · 4 productsIn addition, Emerson recommends users of affected products continue to utilize current cybersecurity industry best practices and ensure the affected products are connected to a well-protected network and properly segmented from the Internet. For more information see the Emerson Security notificatio…
Mitigation from the vendor CISA ICSA-21-138-01 · 4 productsOne of the cybersecurity best practices should include configuring web browsers to prohibit storage of user information such as login names and passwords.

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.15.3read 2026-10-23
NVDCVSS 2.05read 2026-10-23
CNAweakness (CWE)CWE-539read 2026-10-23
FIRST EPSSEPSS score0.9 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Published: 2021-05-20
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-27463?

Is CVE-2021-27463 actively exploited?

Active exploitation of CVE-2021-27463 has not been confirmed. Its EPSS score was 0.9% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-27463?

CVE-2021-27463 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Running ICSA-21-138-01_Emerson? Hear about its next vulnerability

Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

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