How severe is CVE-2005-2021?

CVE-2005-2021 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2005-2021 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2005-2021?

CVE-2005-2021 primarily affects Cpanel. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2005-2021?

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

When was CVE-2005-2021 published?

CVE-2005-2021 was published on 2005-06-20 and last updated on 2026-06-16.

CVE-2005-2021

CVE-2005-2021 is a medium-severity vulnerability in Cpanel with a CVSS 2.0 base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 3% (84th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Cpanel
Published: 2005-06-20
Last modified: 2026-06-16

Description

Cross-site scripting (XSS) vulnerability in cPanel 9.1 and earlier allows remote attackers to inject arbitrary web script or HTML via the user parameter in the login page.

Frequently asked questions

What is CVE-2005-2021?: Cross-site scripting (XSS) vulnerability in cPanel 9.1 and earlier allows remote attackers to inject arbitrary web script or HTML via the user parameter in the login page.
How severe is CVE-2005-2021?: CVE-2005-2021 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2005-2021 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2005-2021?: CVE-2005-2021 primarily affects Cpanel. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2005-2021?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2005-2021 published?: CVE-2005-2021 was published on 2005-06-20 and last updated on 2026-06-16.

References

http://www.securityfocus.com/bid/13996

Affected products (12)

cpe:2.3:a:cpanel:cpanel:5.0:*:*:*:*:*:*:*
cpe:2.3:a:cpanel:cpanel:5.3:*:*:*:*:*:*:*
cpe:2.3:a:cpanel:cpanel:6.0:*:*:*:*:*:*:*
cpe:2.3:a:cpanel:cpanel:6.2:*:*:*:*:*:*:*
cpe:2.3:a:cpanel:cpanel:6.4:*:*:*:*:*:*:*
cpe:2.3:a:cpanel:cpanel:6.4.1:*:*:*:*:*:*:*
cpe:2.3:a:cpanel:cpanel:6.4.2:*:*:*:*:*:*:*
cpe:2.3:a:cpanel:cpanel:6.4.2_stable_48:*:*:*:*:*:*:*
cpe:2.3:a:cpanel:cpanel:7.0:*:*:*:*:*:*:*
cpe:2.3:a:cpanel:cpanel:8.0:*:*:*:*:*:*:*
cpe:2.3:a:cpanel:cpanel:9.0:*:*:*:*:*:*:*
cpe:2.3:a:cpanel:cpanel:9.1:*:*:*:*:*:*:*

More vulnerabilities in Cpanel

CVE-2004-1770 — Critical (CVSS 10.0): The login page for cPanel 9.1.0, and possibly other versions, allows remote attackers to execute arbitrary code via…
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CVE-2003-1425 — Critical (CVSS 10.0): guestbook.cgi in cPanel 5.0 allows remote attackers to execute arbitrary commands via the template parameter.
CVE-2026-41940 — Critical (CVSS 9.8): cPanel and WHM versions after 11.40 contain an authentication bypass vulnerability in the login flow that allows…
CVE-2020-26108 — Critical (CVSS 9.8): cPanel before 88.0.13 mishandles file-extension dispatching, leading to code execution (SEC-488).
CVE-2020-26105 — Critical (CVSS 9.8): In cPanel before 88.0.3, insecure chkservd test credentials are used on a templated VM (SEC-554).

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