How severe is CVE-2021-26991?

CVE-2021-26991 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 none, integrity high, and availability none.

Is CVE-2021-26991 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-26991?

CVE-2021-26991 affects Netapp Cloud Manager. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-26991?

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-2021-26991 published?

CVE-2021-26991 was published on 2021-03-19 and last updated on 2026-06-17.

CVE-2021-26991

CVE-2021-26991 is a high-severity vulnerability in Netapp Cloud Manager 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.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (64th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Netapp Cloud Manager
Published: 2021-03-19
Last modified: 2026-06-17

Description

Cloud Manager versions prior to 3.9.4 contain an insecure Cross-Origin Resource Sharing (CORS) policy which could allow a remote attacker to interact with Cloud Manager.

Frequently asked questions

What is CVE-2021-26991?: Cloud Manager versions prior to 3.9.4 contain an insecure Cross-Origin Resource Sharing (CORS) policy which could allow a remote attacker to interact with Cloud Manager.
How severe is CVE-2021-26991?: CVE-2021-26991 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 none, integrity high, and availability none.
Is CVE-2021-26991 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-26991?: CVE-2021-26991 affects Netapp Cloud Manager. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-26991?: 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-2021-26991 published?: CVE-2021-26991 was published on 2021-03-19 and last updated on 2026-06-17.

References

https://security.netapp.com/advisory/NTAP-20210318-0002

Affected products (1)

cpe:2.3:a:netapp:cloud_manager:*:*:*:*:*:*:*:*

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