How severe is CVE-2021-43067?

CVE-2021-43067 has a CVSS 3.x base score of 8.3, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity high, and availability low.

Is CVE-2021-43067 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-43067?

CVE-2021-43067 primarily affects Fortinet Fortiauthenticator. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-43067?

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-2021-43067 published?

CVE-2021-43067 was published on 2021-12-08 and last updated on 2026-06-17.

CVE-2021-43067

CVE-2021-43067 is a high-severity vulnerability in Fortinet Fortiauthenticator with a CVSS 3.x base score of 8.3. 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-200.

Key facts

Severity: High (CVSS 3.x base score 8.3)
CVSS v2: 4.3
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Fortinet Fortiauthenticator
Published: 2021-12-08
Last modified: 2026-06-17

Description

A exposure of sensitive information to an unauthorized actor in Fortinet FortiAuthenticator version 6.4.0, version 6.3.2 and below, version 6.2.1 and below, version 6.1.2 and below, version 6.0.7 to 6.0.1 allows attacker to duplicate a target LDAP user 2 factors authentication token via crafted HTTP requests.

Frequently asked questions

What is CVE-2021-43067?: A exposure of sensitive information to an unauthorized actor in Fortinet FortiAuthenticator version 6.4.0, version 6.3.2 and below, version 6.2.1 and below, version 6.1.2 and below, version 6.0.7 to 6.0.1 allows attacker to duplicate a target LDAP user 2 factors authentication token via crafted HTTP requests.
How severe is CVE-2021-43067?: CVE-2021-43067 has a CVSS 3.x base score of 8.3, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity high, and availability low.
Is CVE-2021-43067 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-43067?: CVE-2021-43067 primarily affects Fortinet Fortiauthenticator. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-43067?: 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-2021-43067 published?: CVE-2021-43067 was published on 2021-12-08 and last updated on 2026-06-17.

References

https://fortiguard.com/advisory/FG-IR-21-211

Affected products (10)

cpe:2.3:a:fortinet:fortiauthenticator:*:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortiauthenticator:6.1.0:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortiauthenticator:6.1.1:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortiauthenticator:6.1.2:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortiauthenticator:6.2.0:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortiauthenticator:6.2.1:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortiauthenticator:6.3.0:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortiauthenticator:6.3.1:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortiauthenticator:6.3.2:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortiauthenticator:6.4.0:*:*:*:*:*:*:*

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