How severe is CVE-2021-33816?

CVE-2021-33816 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-2021-33816 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-33816?

CVE-2021-33816 affects Dolibarr Dolibarr Erp/crm. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-33816?

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-2021-33816 published?

CVE-2021-33816 was published on 2021-11-10 and last updated on 2026-06-17.

CVE-2021-33816

CVE-2021-33816 is a critical-severity vulnerability in Dolibarr Dolibarr Erp/crm 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-94.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 4% (89th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-94
Affected product: Dolibarr Dolibarr Erp/crm
Published: 2021-11-10
Last modified: 2026-06-17

Description

The website builder module in Dolibarr 13.0.2 allows remote PHP code execution because of an incomplete protection mechanism in which system, exec, and shell_exec are blocked but backticks are not blocked.

Frequently asked questions

What is CVE-2021-33816?: The website builder module in Dolibarr 13.0.2 allows remote PHP code execution because of an incomplete protection mechanism in which system, exec, and shell_exec are blocked but backticks are not blocked.
How severe is CVE-2021-33816?: CVE-2021-33816 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-2021-33816 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-33816?: CVE-2021-33816 affects Dolibarr Dolibarr Erp/crm. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-33816?: 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-2021-33816 published?: CVE-2021-33816 was published on 2021-11-10 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:dolibarr:dolibarr_erp\/crm:13.0.2:*:*:*:*:*:*:*

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