How severe is CVE-2021-41020?

CVE-2021-41020 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-41020 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-41020?

CVE-2021-41020 affects Fortinet Fortiisolator. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-41020?

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-2021-41020 published?

CVE-2021-41020 was published on 2022-05-04 and last updated on 2026-06-17.

CVE-2021-41020

CVE-2021-41020 is a high-severity vulnerability in Fortinet Fortiisolator with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.5
EPSS exploit prediction: 1% (43rd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Fortinet Fortiisolator
Published: 2022-05-04
Last modified: 2026-06-17

Description

An improper access control vulnerability [CWE-284] in FortiIsolator versions 2.3.2 and below may allow an authenticated, non privileged attacker to regenerate the CA certificate via the regeneration URL.

Frequently asked questions

What is CVE-2021-41020?: An improper access control vulnerability [CWE-284] in FortiIsolator versions 2.3.2 and below may allow an authenticated, non privileged attacker to regenerate the CA certificate via the regeneration URL.
How severe is CVE-2021-41020?: CVE-2021-41020 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-41020 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-41020?: CVE-2021-41020 affects Fortinet Fortiisolator. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-41020?: 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-2021-41020 published?: CVE-2021-41020 was published on 2022-05-04 and last updated on 2026-06-17.

References

https://fortiguard.com/psirt/FG-IR-21-040

Affected products (1)

cpe:2.3:a:fortinet:fortiisolator:*:*:*:*:*:*:*:*

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