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CVE-2021-34815

17
FAUCET Score

CVE-2021-34815 describes a Cross-Site Scripting (XSS) vulnerability in CheckSec Canopy versions prior to 3.5.2, specifically affecting the login page through the LOGIN_PAGE_DISCLAIMER parameter. This medium-severity vulnerability (CVSS 4.8) requires high privileges and user interaction, allowing an attacker to achieve low impact on confidentiality and integrity. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.5.2CPE matchmatch criteria
cpe:2.3:a:checksec:canopy:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

4.8MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
1.7
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.84%
Probability of exploitation in next 30 days
EPSS Percentile
54.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0084 is in the 91st percentile among its peer group of 4,931 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

checksec.com / canopy.html
Product
compass-security.com / en/research/advisories
Third Party Advisory
compass-security.com / fileadmin/Research/Advisories/2021-10_CSNC-2021-015-Checksec_Canopy_HTLM_Injection.txt
ExploitThird Party Advisory