How severe is CVE-2021-33898?

CVE-2021-33898 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-33898 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-33898?

CVE-2021-33898 affects Invoiceninja Invoice Ninja. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-33898?

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

When was CVE-2021-33898 published?

CVE-2021-33898 was published on 2021-06-06 and last updated on 2026-06-17.

CVE-2021-33898

CVE-2021-33898 is a high-severity vulnerability in Invoiceninja Invoice Ninja with a CVSS 3.x base score of 8.1. 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-502.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v2: 6.8
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-502
Affected product: Invoiceninja Invoice Ninja
Published: 2021-06-06
Last modified: 2026-06-17

Description

In Invoice Ninja before 4.4.0, there is an unsafe call to unserialize() in app/Ninja/Repositories/AccountRepository.php that may allow an attacker to deserialize arbitrary PHP classes. In certain contexts, this can result in remote code execution. The attacker's input must be hosted at http://www.geoplugin.net (cleartext HTTP), and thus a successful attack requires spoofing that site or obtaining control of it.

Frequently asked questions

What is CVE-2021-33898?: In Invoice Ninja before 4.4.0, there is an unsafe call to unserialize() in app/Ninja/Repositories/AccountRepository.php that may allow an attacker to deserialize arbitrary PHP classes. In certain contexts, this can result in remote code execution. The attacker's input must be hosted at http://www.geoplugin.net (cleartext HTTP), and thus a successful attack requires spoofing that site or obtaining control of it.
How severe is CVE-2021-33898?: CVE-2021-33898 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-33898 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-33898?: CVE-2021-33898 affects Invoiceninja Invoice Ninja. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-33898?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-33898 published?: CVE-2021-33898 was published on 2021-06-06 and last updated on 2026-06-17.

References

https://github.com/invoiceninja/invoiceninja/issues/5909

Affected products (1)

cpe:2.3:a:invoiceninja:invoice_ninja:*:*:*:*:*:*:*:*

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