How severe is CVE-2021-3021?

CVE-2021-3021 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-2021-3021 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3021?

CVE-2021-3021 affects Ispconfig. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-3021?

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-2021-3021 published?

CVE-2021-3021 was published on 2021-01-05 and last updated on 2026-06-17.

CVE-2021-3021

CVE-2021-3021 is a critical-severity vulnerability in Ispconfig 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-89.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (80th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-89
Affected product: Ispconfig
Published: 2021-01-05
Last modified: 2026-06-17

Description

ISPConfig before 3.2.2 allows SQL injection.

Frequently asked questions

What is CVE-2021-3021?: ISPConfig before 3.2.2 allows SQL injection.
How severe is CVE-2021-3021?: CVE-2021-3021 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-2021-3021 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3021?: CVE-2021-3021 affects Ispconfig. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-3021?: 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-2021-3021 published?: CVE-2021-3021 was published on 2021-01-05 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:ispconfig:ispconfig:*:*:*:*:*:*:*:*

More vulnerabilities in Ispconfig

CVE-2020-9398 — Critical (CVSS 9.8): ISPConfig before 3.1.15p3, when the undocumented reverse_proxy_panel_allowed=sites option is manually enabled, allows…
CVE-2012-2087 — Critical (CVSS 9.8): ISPConfig 3.0.4.3: the "Add new Webdav user" can chmod and chown entire server from client interface.
CVE-2013-3629 — High (CVSS 8.8): ISPConfig 3.0.5.2 has Arbitrary PHP Code Execution
CVE-2017-17384 — High (CVSS 8.8): ISPConfig 3.x before 3.1.9 allows remote authenticated users to obtain root access by creating a crafted cron job.
CVE-2018-17984 — High (CVSS 7.8): An unanchored /[a-z]{2}/ regular expression in ISPConfig before 3.1.13 makes it possible to include arbitrary files,…
CVE-2006-3042 — High (CVSS 7.5): Multiple PHP remote file inclusion vulnerabilities in ISPConfig 2.2.3 allow remote attackers to execute arbitrary PHP…

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