How severe is CVE-2021-34815?

CVE-2021-34815 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-34815 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-2021-34815?

CVE-2021-34815 affects Checksec Canopy. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-34815?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-34815 published?

CVE-2021-34815 was published on 2021-06-18 and last updated on 2026-06-17.

CVE-2021-34815

CVE-2021-34815 is a medium-severity vulnerability in Checksec Canopy with a CVSS 3.x base score of 4.8. 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: Medium (CVSS 3.x base score 4.8)
CVSS v2: 3.5
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Checksec Canopy
Published: 2021-06-18
Last modified: 2026-06-17

Description

CheckSec Canopy before 3.5.2 allows XSS attacks against the login page via the LOGIN_PAGE_DISCLAIMER parameter.

Frequently asked questions

What is CVE-2021-34815?: CheckSec Canopy before 3.5.2 allows XSS attacks against the login page via the LOGIN_PAGE_DISCLAIMER parameter.
How severe is CVE-2021-34815?: CVE-2021-34815 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-34815 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-2021-34815?: CVE-2021-34815 affects Checksec Canopy. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-34815?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-34815 published?: CVE-2021-34815 was published on 2021-06-18 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:checksec:canopy:*:*:*:*:*:*:*:*

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