How severe is CVE-2021-27457?

CVE-2021-27457 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-27457 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-27457?

CVE-2021-27457 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-2021-27457?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-27457 published?

CVE-2021-27457 was published on 2021-05-20 and last updated on 2026-06-17.

CVE-2021-27457

CVE-2021-27457 is a high-severity vulnerability in Emerson X-stream Enhanced Xegp Firmware with a CVSS 3.x base score of 7.5. 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-327.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-327
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 products utilize a weak encryption algorithm for storage of sensitive data, which may allow an attacker to more easily obtain credentials used for access.

Frequently asked questions

What is CVE-2021-27457?: A vulnerability has been found in multiple revisions of Emerson Rosemount X-STREAM Gas Analyzer. The affected products utilize a weak encryption algorithm for storage of sensitive data, which may allow an attacker to more easily obtain credentials used for access.
How severe is CVE-2021-27457?: CVE-2021-27457 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-27457 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27457?: CVE-2021-27457 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-2021-27457?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-27457 published?: CVE-2021-27457 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-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…
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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