How severe is CVE-2021-36182?

CVE-2021-36182 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-2021-36182 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-36182?

CVE-2021-36182 affects Fortinet Fortiweb. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-36182?

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-2021-36182 published?

CVE-2021-36182 was published on 2021-09-08 and last updated on 2026-06-17.

CVE-2021-36182

CVE-2021-36182 is a high-severity vulnerability in Fortinet Fortiweb 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. The underlying weakness is classified as CWE-78.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.5
EPSS exploit prediction: 2% (77th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Fortinet Fortiweb
Published: 2021-09-08
Last modified: 2026-06-17

Description

A Improper neutralization of special elements used in a command ('Command Injection') in Fortinet FortiWeb version 6.3.13 and below allows attacker to execute unauthorized code or commands via crafted HTTP requests

Frequently asked questions

What is CVE-2021-36182?: A Improper neutralization of special elements used in a command ('Command Injection') in Fortinet FortiWeb version 6.3.13 and below allows attacker to execute unauthorized code or commands via crafted HTTP requests
How severe is CVE-2021-36182?: CVE-2021-36182 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-2021-36182 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-36182?: CVE-2021-36182 affects Fortinet Fortiweb. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-36182?: 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-2021-36182 published?: CVE-2021-36182 was published on 2021-09-08 and last updated on 2026-06-17.

References

https://fortiguard.com/advisory/FG-IR-21-047

Affected products (1)

cpe:2.3:a:fortinet:fortiweb:*:*:*:*:*:*:*:*

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