How severe is CVE-2021-27001?

CVE-2021-27001 has a CVSS 3.x base score of 5.5, 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 high, and availability none.

Is CVE-2021-27001 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-27001?

CVE-2021-27001 primarily affects Netapp Clustered Data Ontap. In total, 31 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-27001?

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

When was CVE-2021-27001 published?

CVE-2021-27001 was published on 2021-10-19 and last updated on 2026-06-17.

CVE-2021-27001

CVE-2021-27001 is a medium-severity vulnerability in Netapp Clustered Data Ontap with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v2: 2.1
EPSS exploit prediction: 0% (16th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Netapp Clustered Data Ontap
Published: 2021-10-19
Last modified: 2026-06-17

Description

Clustered Data ONTAP versions 9.x prior to 9.5P18, 9.6P16, 9.7P16, 9.8P7 and 9.9.1P2 are susceptible to a vulnerability which could allow an authenticated privileged local attacker to arbitrarily modify Compliance-mode WORM data prior to the end of the retention period.

Frequently asked questions

What is CVE-2021-27001?: Clustered Data ONTAP versions 9.x prior to 9.5P18, 9.6P16, 9.7P16, 9.8P7 and 9.9.1P2 are susceptible to a vulnerability which could allow an authenticated privileged local attacker to arbitrarily modify Compliance-mode WORM data prior to the end of the retention period.
How severe is CVE-2021-27001?: CVE-2021-27001 has a CVSS 3.x base score of 5.5, 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 high, and availability none.
Is CVE-2021-27001 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27001?: CVE-2021-27001 primarily affects Netapp Clustered Data Ontap. In total, 31 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-27001?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-27001 published?: CVE-2021-27001 was published on 2021-10-19 and last updated on 2026-06-17.

References

https://security.netapp.com/advisory/ntap-20211018-0001

Affected products (31)

cpe:2.3:o:netapp:clustered_data_ontap:*:*:*:*:*:*:*:*
cpe:2.3:o:netapp:clustered_data_ontap:9.5:-:*:*:*:*:*:*
cpe:2.3:o:netapp:clustered_data_ontap:9.5:p12:*:*:*:*:*:*
cpe:2.3:o:netapp:clustered_data_ontap:9.5:p13:*:*:*:*:*:*
cpe:2.3:o:netapp:clustered_data_ontap:9.5:p14:*:*:*:*:*:*
cpe:2.3:o:netapp:clustered_data_ontap:9.5:p15:*:*:*:*:*:*
cpe:2.3:o:netapp:clustered_data_ontap:9.5:p16:*:*:*:*:*:*
cpe:2.3:o:netapp:clustered_data_ontap:9.5:p17:*:*:*:*:*:*
cpe:2.3:o:netapp:clustered_data_ontap:9.5:p6:*:*:*:*:*:*
cpe:2.3:o:netapp:clustered_data_ontap:9.5:p8:*:*:*:*:*:*
cpe:2.3:o:netapp:clustered_data_ontap:9.5:p9:*:*:*:*:*:*
cpe:2.3:o:netapp:clustered_data_ontap:9.6:-:*:*:*:*:*:*
cpe:2.3:o:netapp:clustered_data_ontap:9.6:p1:*:*:*:*:*:*
cpe:2.3:o:netapp:clustered_data_ontap:9.6:p12:*:*:*:*:*:*
cpe:2.3:o:netapp:clustered_data_ontap:9.6:p15:*:*:*:*:*:*
cpe:2.3:o:netapp:clustered_data_ontap:9.6:p3:*:*:*:*:*:*
cpe:2.3:o:netapp:clustered_data_ontap:9.6:p4:*:*:*:*:*:*
cpe:2.3:o:netapp:clustered_data_ontap:9.6:p7:*:*:*:*:*:*
cpe:2.3:o:netapp:clustered_data_ontap:9.6:p8:*:*:*:*:*:*
cpe:2.3:o:netapp:clustered_data_ontap:9.6:p9:*:*:*:*:*:*
cpe:2.3:o:netapp:clustered_data_ontap:9.7:-:*:*:*:*:*:*
cpe:2.3:o:netapp:clustered_data_ontap:9.7:p12:*:*:*:*:*:*
cpe:2.3:o:netapp:clustered_data_ontap:9.7:p13:*:*:*:*:*:*
cpe:2.3:o:netapp:clustered_data_ontap:9.7:p14:*:*:*:*:*:*
cpe:2.3:o:netapp:clustered_data_ontap:9.7:p7:*:*:*:*:*:*
cpe:2.3:o:netapp:clustered_data_ontap:9.7:p9:*:*:*:*:*:*
cpe:2.3:o:netapp:clustered_data_ontap:9.7:rc1:*:*:*:*:*:*
cpe:2.3:o:netapp:clustered_data_ontap:9.8:-:*:*:*:*:*:*
cpe:2.3:o:netapp:clustered_data_ontap:9.8:p3:*:*:*:*:*:*
cpe:2.3:o:netapp:clustered_data_ontap:9.8:p5:*:*:*:*:*:*
cpe:2.3:o:netapp:clustered_data_ontap:9.9.1:-:*:*:*:*:*:*

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