How severe is CVE-2021-3797?

CVE-2021-3797 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-3797 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3797?

CVE-2021-3797 affects Hestiacp Control Panel. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-3797?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-3797 published?

CVE-2021-3797 was published on 2021-09-15 and last updated on 2026-06-17.

CVE-2021-3797

CVE-2021-3797 is a critical-severity vulnerability in Hestiacp Control Panel with a CVSS 3.x base score of 9.8. 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-597.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-597
Affected product: Hestiacp Control Panel
Published: 2021-09-15
Last modified: 2026-06-17

Description

hestiacp is vulnerable to Use of Wrong Operator in String Comparison

Frequently asked questions

What is CVE-2021-3797?: hestiacp is vulnerable to Use of Wrong Operator in String Comparison
How severe is CVE-2021-3797?: CVE-2021-3797 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-3797 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3797?: CVE-2021-3797 affects Hestiacp Control Panel. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-3797?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-3797 published?: CVE-2021-3797 was published on 2021-09-15 and last updated on 2026-06-17.

References

Affected products (1)

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

More vulnerabilities in Hestiacp Control Panel

CVE-2022-1509 — Critical (CVSS 9.9): Command Injection Vulnerability in GitHub repository hestiacp/hestiacp prior to 1.5.12. An authenticated remote…
CVE-2022-2550 — High (CVSS 8.8): OS Command Injection in GitHub repository hestiacp/hestiacp prior to 1.6.5.
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.
CVE-2020-10966 — Medium (CVSS 6.5): In the Password Reset Module in VESTA Control Panel through 0.9.8-25 and Hestia Control Panel before 1.1.1, Host header…

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