How severe is CVE-2021-27465?

CVE-2021-27465 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-27465 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-27465?

CVE-2021-27465 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-2021-27465?

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

When was CVE-2021-27465 published?

CVE-2021-27465 was published on 2021-05-20 and last updated on 2026-06-17.

CVE-2021-27465

CVE-2021-27465 is a medium-severity vulnerability in Emerson X-stream Enhanced Xegp Firmware with a CVSS 3.x base score of 6.1. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
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 do not validate webpage input, which could allow an attacker to inject arbitrary HTML code into a webpage. This would allow an attacker to modify the page and display incorrect or undesirable data.

Frequently asked questions

What is CVE-2021-27465?: A vulnerability has been found in multiple revisions of Emerson Rosemount X-STREAM Gas Analyzer. The affected applications do not validate webpage input, which could allow an attacker to inject arbitrary HTML code into a webpage. This would allow an attacker to modify the page and display incorrect or undesirable data.
How severe is CVE-2021-27465?: CVE-2021-27465 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-27465 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27465?: CVE-2021-27465 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-2021-27465?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-27465 published?: CVE-2021-27465 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-2021-27463 — Medium (CVSS 5.3): A vulnerability has been found in multiple revisions of Emerson Rosemount X-STREAM Gas Analyzer. The affected…

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