How severe is CVE-2021-36177?

CVE-2021-36177 has a CVSS 3.x base score of 4.2, rated medium severity. It is exploitable over an adjacent network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-36177 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-36177?

CVE-2021-36177 affects Fortinet Fortiauthenticator. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-36177?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-36177 published?

CVE-2021-36177 was published on 2022-02-02 and last updated on 2026-06-17.

CVE-2021-36177

CVE-2021-36177 is a medium-severity vulnerability in Fortinet Fortiauthenticator with a CVSS 3.x base score of 4.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 4.2)
CVSS v2: 3.3
EPSS exploit prediction: 0% (22nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Fortinet Fortiauthenticator
Published: 2022-02-02
Last modified: 2026-06-17

Description

An improper access control vulnerability [CWE-284] in FortiAuthenticator HA service 6.3.2 and below, 6.2.x, 6.1.x, 6.0.x may allow an attacker on the same vlan as the HA management interface to make an unauthenticated direct connection to the FAC's database.

Frequently asked questions

What is CVE-2021-36177?: An improper access control vulnerability [CWE-284] in FortiAuthenticator HA service 6.3.2 and below, 6.2.x, 6.1.x, 6.0.x may allow an attacker on the same vlan as the HA management interface to make an unauthenticated direct connection to the FAC's database.
How severe is CVE-2021-36177?: CVE-2021-36177 has a CVSS 3.x base score of 4.2, rated medium severity. It is exploitable over an adjacent network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-36177 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-36177?: CVE-2021-36177 affects Fortinet Fortiauthenticator. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-36177?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-36177 published?: CVE-2021-36177 was published on 2022-02-02 and last updated on 2026-06-17.

References

https://fortiguard.com/psirt/FG-IR-20-217

Affected products (1)

cpe:2.3:a:fortinet:fortiauthenticator:*:*:*:*:*:*:*:*

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