How severe is CVE-2021-21515?

CVE-2021-21515 has a CVSS 3.x base score of 9.0, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-21515 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21515?

CVE-2021-21515 primarily affects Dell Emc Sourceone. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-21515?

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

When was CVE-2021-21515 published?

CVE-2021-21515 was published on 2021-03-01 and last updated on 2026-06-17.

CVE-2021-21515

CVE-2021-21515 is a critical-severity vulnerability in Dell Emc Sourceone with a CVSS 3.x base score of 9.0. 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-79.

Key facts

Severity: Critical (CVSS 3.x base score 9.0)
CVSS v2: 3.5
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Dell Emc Sourceone
Published: 2021-03-01
Last modified: 2026-06-17

Description

Dell EMC SourceOne, versions 7.2SP10 and prior, contain a Stored Cross-Site Scripting vulnerability. A remote low privileged attacker may potentially exploit this vulnerability, to hijack user sessions or to trick a victim application user to unknowingly send arbitrary requests to the server.

Frequently asked questions

What is CVE-2021-21515?: Dell EMC SourceOne, versions 7.2SP10 and prior, contain a Stored Cross-Site Scripting vulnerability. A remote low privileged attacker may potentially exploit this vulnerability, to hijack user sessions or to trick a victim application user to unknowingly send arbitrary requests to the server.
How severe is CVE-2021-21515?: CVE-2021-21515 has a CVSS 3.x base score of 9.0, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-21515 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21515?: CVE-2021-21515 primarily affects Dell Emc Sourceone. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-21515?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-21515 published?: CVE-2021-21515 was published on 2021-03-01 and last updated on 2026-06-17.

References

https://www.dell.com/support/kbdoc/en-us/000183430/dsa-2021-043-dell-emc-sourceone-java-script-xss-stored-vulnerability

Affected products (11)

cpe:2.3:a:dell:emc_sourceone:*:*:*:*:*:*:*:*
cpe:2.3:a:dell:emc_sourceone:7.2:-:*:*:*:*:*:*
cpe:2.3:a:dell:emc_sourceone:7.2:sp1:*:*:*:*:*:*
cpe:2.3:a:dell:emc_sourceone:7.2:sp2:*:*:*:*:*:*
cpe:2.3:a:dell:emc_sourceone:7.2:sp3:*:*:*:*:*:*
cpe:2.3:a:dell:emc_sourceone:7.2:sp4:*:*:*:*:*:*
cpe:2.3:a:dell:emc_sourceone:7.2:sp5:*:*:*:*:*:*
cpe:2.3:a:dell:emc_sourceone:7.2:sp6:*:*:*:*:*:*
cpe:2.3:a:dell:emc_sourceone:7.2:sp7:*:*:*:*:*:*
cpe:2.3:a:dell:emc_sourceone:7.2:sp8:*:*:*:*:*:*
cpe:2.3:a:dell:emc_sourceone:7.2:sp9:*:*:*:*:*:*

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