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CVE-2021-21515

19
FAUCET Score

CVE-2021-21515 describes a Stored Cross-Site Scripting (XSS) vulnerability in Dell EMC SourceOne, affecting versions 7.2SP10 and earlier. A low-privileged remote attacker could exploit this flaw to hijack user sessions or trick users into unknowingly sending arbitrary requests to the server. With a CVSS score of 5.4 (Medium), the vulnerability requires user interaction and has low impact on confidentiality and integrity. There is currently no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 7.2CPE matchmatch criteria
cpe:2.3:a:dell:emc_sourceone:*:*:*:*:*:*:*:*
7.2CPE matchmatch criteria
cpe:2.3:a:dell:emc_sourceone:7.2:-:*:*:*:*:*:*
7.2CPE matchmatch criteria
cpe:2.3:a:dell:emc_sourceone:7.2:sp1:*:*:*:*:*:*
7.2CPE matchmatch criteria
cpe:2.3:a:dell:emc_sourceone:7.2:sp2:*:*:*:*:*:*
7.2CPE matchmatch criteria
cpe:2.3:a:dell:emc_sourceone:7.2:sp3:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.0CRITICAL

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.3
Impact Score
6.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.82%
Probability of exploitation in next 30 days
EPSS Percentile
53.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0082 is in the 88th percentile among its peer group of 15,225 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

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