How severe is CVE-2021-21548?

CVE-2021-21548 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over local access with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-21548 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21548?

CVE-2021-21548 primarily affects Dell Emc Unisphere For Powermax. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-21548?

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-2021-21548 published?

CVE-2021-21548 was published on 2023-03-17 and last updated on 2026-06-17.

CVE-2021-21548

CVE-2021-21548 is a high-severity vulnerability in Dell Emc Unisphere For Powermax with a CVSS 3.x base score of 7.4. 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-295.

Key facts

Severity: High (CVSS 3.x base score 7.4)
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-295
Affected product: Dell Emc Unisphere For Powermax
Published: 2023-03-17
Last modified: 2026-06-17

Description

Dell EMC Unisphere for PowerMax versions before 9.1.0.27, Dell EMC Unisphere for PowerMax Virtual Appliance versions before 9.1.0.27, and PowerMax OS Release 5978 contain an improper certificate validation vulnerability. An unauthenticated remote attacker may potentially exploit this vulnerability to carry out a man-in-the-middle attack by supplying a crafted certificate and intercepting the victim's traffic to view or modify a victim’s data in transit.

Frequently asked questions

What is CVE-2021-21548?: Dell EMC Unisphere for PowerMax versions before 9.1.0.27, Dell EMC Unisphere for PowerMax Virtual Appliance versions before 9.1.0.27, and PowerMax OS Release 5978 contain an improper certificate validation vulnerability. An unauthenticated remote attacker may potentially exploit this vulnerability to carry out a man-in-the-middle attack by supplying a crafted certificate and intercepting the victim's traffic to view or modify a victim’s data in transit.
How severe is CVE-2021-21548?: CVE-2021-21548 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over local access with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-21548 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21548?: CVE-2021-21548 primarily affects Dell Emc Unisphere For Powermax. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-21548?: 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-2021-21548 published?: CVE-2021-21548 was published on 2023-03-17 and last updated on 2026-06-17.

References

https://www.dell.com/support/kbdoc/en-uk/000189606/dsa-2021-134-dell-emc-unisphere-for-powermax-dell-emc-unisphere-for-powermax-virtual-appliance-dell-emc-solutions-enabler-virtual-appliance-and-dell-emc-powermax-embedded-management-security-update-for-multiple-third-party-component-vulnerabilities

Affected products (3)

cpe:2.3:a:dell:emc_unisphere_for_powermax:*:*:*:*:*:*:*:*
cpe:2.3:a:dell:emc_unisphere_for_powermax_virtual_appliance:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:powermax_os:5978:*:*:*:*:*:*:*

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