How severe is CVE-2021-27231?

CVE-2021-27231 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-27231 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-27231?

CVE-2021-27231 affects Hestiacp Control Panel. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-27231?

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

When was CVE-2021-27231 published?

CVE-2021-27231 was published on 2021-02-16 and last updated on 2026-06-17.

CVE-2021-27231

CVE-2021-27231 is a medium-severity vulnerability in Hestiacp Control Panel with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v2: 5.5
EPSS exploit prediction: 1% (69th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Hestiacp Control Panel
Published: 2021-02-16
Last modified: 2026-06-17

Description

Hestia Control Panel 1.3.5 and below, in a shared-hosting environment, sometimes allows remote authenticated users to create a subdomain for a different customer's domain name, leading to spoofing of services or email messages.

Frequently asked questions

What is CVE-2021-27231?: Hestia Control Panel 1.3.5 and below, in a shared-hosting environment, sometimes allows remote authenticated users to create a subdomain for a different customer's domain name, leading to spoofing of services or email messages.
How severe is CVE-2021-27231?: CVE-2021-27231 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-27231 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27231?: CVE-2021-27231 affects Hestiacp Control Panel. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-27231?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-27231 published?: CVE-2021-27231 was published on 2021-02-16 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:hestiacp:control_panel:*:*:*:*:*:*:*:*

More vulnerabilities in Hestiacp Control Panel

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CVE-2022-2636 — High (CVSS 8.5): Improper Control of Generation of Code ('Code Injection') in GitHub repository hestiacp/hestiacp prior to 1.6.6.
CVE-2023-5839 — High (CVSS 7.8): Privilege Chaining in GitHub repository hestiacp/hestiacp prior to 1.8.9.
CVE-2022-2626 — High (CVSS 7.2): Incorrect Privilege Assignment in GitHub repository hestiacp/hestiacp prior to 1.6.6.

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