How severe is CVE-2021-27463?

CVE-2021-27463 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2021-27463 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-27463?

CVE-2021-27463 primarily affects Emerson X-stream Enhanced Xegp Firmware. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-27463?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-27463 published?

CVE-2021-27463 was published on 2021-05-20 and last updated on 2026-06-17.

CVE-2021-27463

CVE-2021-27463 is a medium-severity vulnerability in Emerson X-stream Enhanced Xegp Firmware with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-539.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 1% (55th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-539
Affected product: Emerson X-stream Enhanced Xegp Firmware
Published: 2021-05-20
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-27463?: 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.
How severe is CVE-2021-27463?: CVE-2021-27463 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2021-27463 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27463?: CVE-2021-27463 primarily affects Emerson X-stream Enhanced Xegp Firmware. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-27463?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-27463 published?: CVE-2021-27463 was published on 2021-05-20 and last updated on 2026-06-17.

References

https://us-cert.cisa.gov/ics/advisories/icsa-21-138-01

Affected products (4)

cpe:2.3:o:emerson:x-stream_enhanced_xegp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:emerson:x-stream_enhanced_xegk_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:emerson:x-stream_enhanced_xefd_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:emerson:x-stream_enhanced_xexf_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Emerson X-stream Enhanced Xegp Firmware

CVE-2021-27459 — Critical (CVSS 9.8): A vulnerability has been found in multiple revisions of Emerson Rosemount X-STREAM Gas Analyzer. The webserver of the…
CVE-2021-27461 — High (CVSS 7.5): A vulnerability has been found in multiple revisions of Emerson Rosemount X-STREAM Gas Analyzer. The affected webserver…
CVE-2021-27457 — High (CVSS 7.5): A vulnerability has been found in multiple revisions of Emerson Rosemount X-STREAM Gas Analyzer. The affected products…
CVE-2020-27254 — High (CVSS 7.5): Emerson Rosemount X-STREAM Gas AnalyzerX-STREAM enhanced XEGP, XEGK, XEFD, XEXF – all revisions, The affected…
CVE-2021-27467 — Medium (CVSS 6.1): A vulnerability has been found in multiple revisions of Emerson Rosemount X-STREAM Gas Analyzer. The affected…
CVE-2021-27465 — Medium (CVSS 6.1): A vulnerability has been found in multiple revisions of Emerson Rosemount X-STREAM Gas Analyzer. The affected…

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