How severe is CVE-2020-15864?

CVE-2020-15864 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2020-15864 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-15864?

CVE-2020-15864 affects Quali Cloudshell. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-15864?

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

When was CVE-2020-15864 published?

CVE-2020-15864 was published on 2021-01-17 and last updated on 2026-06-17.

CVE-2020-15864

CVE-2020-15864 is a medium-severity vulnerability in Quali Cloudshell with a CVSS 3.x base score of 6.1. 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 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Quali Cloudshell
Published: 2021-01-17
Last modified: 2026-06-17

Description

An issue was discovered in Quali CloudShell 9.3. An XSS vulnerability in the login page allows an attacker to craft a URL, with a constructor.constructor substring in the username field, that executes a payload when the user visits the /Account/Login page.

Frequently asked questions

What is CVE-2020-15864?: An issue was discovered in Quali CloudShell 9.3. An XSS vulnerability in the login page allows an attacker to craft a URL, with a constructor.constructor substring in the username field, that executes a payload when the user visits the /Account/Login page.
How severe is CVE-2020-15864?: CVE-2020-15864 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2020-15864 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-15864?: CVE-2020-15864 affects Quali Cloudshell. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-15864?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-15864 published?: CVE-2020-15864 was published on 2021-01-17 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:quali:cloudshell:9.3:*:*:*:*:*:*:*

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