Is CVE-2021-27463 actively exploited?

No active exploitation of CVE-2021-27463 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-27463 be exploited remotely?

Yes. CVE-2021-27463 is exploitable remotely over the network (CVSS attack vector: Network).

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

CVE-2021-27463 has a CVSS score of 5.3 (MEDIUM).

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MEDIUM

CVE-2021-27463

CWE-539Published: May 20, 2021· Updated: Jun 17, 2026

5.3

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-27463 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

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

Affected Vendors & Products

emerson8 product(s)

x-stream enhanced xegp firmwarex-stream enhanced xegpx-stream enhanced xegk firmwarex-stream enhanced xegkx-stream enhanced xefd firmwarex-stream enhanced xefdx-stream enhanced xexf firmwarex-stream enhanced xexf

Source: NVD CPE · 8 total CPE entries