How severe is CVE-2021-36171?

CVE-2021-36171 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-2021-36171 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-36171?

CVE-2021-36171 affects Fortinet Fortiportal. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-36171?

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-2021-36171 published?

CVE-2021-36171 was published on 2022-03-01 and last updated on 2026-06-17.

CVE-2021-36171

CVE-2021-36171 is a high-severity vulnerability in Fortinet Fortiportal 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-338.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v2: 6.8
EPSS exploit prediction: 1% (63rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-338
Affected product: Fortinet Fortiportal
Published: 2022-03-01
Last modified: 2026-06-17

Description

The use of a cryptographically weak pseudo-random number generator in the password reset feature of FortiPortal before 6.0.6 may allow a remote unauthenticated attacker to predict parts of or the whole newly generated password within a given time frame.

Frequently asked questions

What is CVE-2021-36171?: The use of a cryptographically weak pseudo-random number generator in the password reset feature of FortiPortal before 6.0.6 may allow a remote unauthenticated attacker to predict parts of or the whole newly generated password within a given time frame.
How severe is CVE-2021-36171?: CVE-2021-36171 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-2021-36171 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-36171?: CVE-2021-36171 affects Fortinet Fortiportal. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-36171?: 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-2021-36171 published?: CVE-2021-36171 was published on 2022-03-01 and last updated on 2026-06-17.

References

https://fortiguard.com/psirt/FG-IR-21-099

Affected products (1)

cpe:2.3:a:fortinet:fortiportal:*:*:*:*:*:*:*:*

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