How severe is CVE-2021-28497?

CVE-2021-28497 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability low.

Is CVE-2021-28497 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-28497?

CVE-2021-28497 affects Arista Metamako Operating System. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-28497?

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

When was CVE-2021-28497 published?

CVE-2021-28497 was published on 2021-09-09 and last updated on 2026-06-17.

CVE-2021-28497

CVE-2021-28497 is a medium-severity vulnerability in Arista Metamako Operating System with a CVSS 3.x base score of 4.4. 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-264.

Key facts

Severity: Medium (CVSS 3.x base score 4.4)
CVSS v2: 4.6
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-264
Affected product: Arista Metamako Operating System
Published: 2021-09-09
Last modified: 2026-06-17

Description

In Arista's MOS (Metamako Operating System) software which is supported on the 7130 product line, under certain conditions, the bash shell might be accessible to unprivileged users in situations where they should not have access. This issue affects: Arista Metamako Operating System All releases in the MOS-0.1x train MOS-0.26.6 and below releases in the MOS-0.2x train MOS-0.31.1 and below releases in the MOS-0.3x train

Frequently asked questions

What is CVE-2021-28497?: In Arista's MOS (Metamako Operating System) software which is supported on the 7130 product line, under certain conditions, the bash shell might be accessible to unprivileged users in situations where they should not have access. This issue affects: Arista Metamako Operating System All releases in the MOS-0.1x train MOS-0.26.6 and below releases in the MOS-0.2x train MOS-0.31.1 and below releases in the MOS-0.3x train
How severe is CVE-2021-28497?: CVE-2021-28497 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability low.
Is CVE-2021-28497 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-28497?: CVE-2021-28497 affects Arista Metamako Operating System. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-28497?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-28497 published?: CVE-2021-28497 was published on 2021-09-09 and last updated on 2026-06-17.

References

https://www.arista.com/en/support/advisories-notices/security-advisories/12913-security-advisory-65

Affected products (1)

cpe:2.3:o:arista:metamako_operating_system:*:*:*:*:*:*:*:*

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