How severe is CVE-2021-22122?

CVE-2021-22122 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-22122 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 11% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-22122?

CVE-2021-22122 affects Fortinet Fortiweb. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-22122?

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

When was CVE-2021-22122 published?

CVE-2021-22122 was published on 2021-02-08 and last updated on 2026-06-17.

CVE-2021-22122

CVE-2021-22122 is a medium-severity vulnerability in Fortinet Fortiweb with a CVSS 3.x base score of 6.1. Its EPSS exploit-prediction score of 11% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 11% (96th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Fortinet Fortiweb
Published: 2021-02-08
Last modified: 2026-06-17

Description

An improper neutralization of input during web page generation in FortiWeb GUI interface 6.3.0 through 6.3.7 and version before 6.2.4 may allow an unauthenticated, remote attacker to perform a reflected cross site scripting attack (XSS) by injecting malicious payload in different vulnerable API end-points.

Frequently asked questions

What is CVE-2021-22122?: An improper neutralization of input during web page generation in FortiWeb GUI interface 6.3.0 through 6.3.7 and version before 6.2.4 may allow an unauthenticated, remote attacker to perform a reflected cross site scripting attack (XSS) by injecting malicious payload in different vulnerable API end-points.
How severe is CVE-2021-22122?: CVE-2021-22122 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-22122 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 11% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-22122?: CVE-2021-22122 affects Fortinet Fortiweb. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-22122?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-22122 published?: CVE-2021-22122 was published on 2021-02-08 and last updated on 2026-06-17.

References

https://fortiguard.com/advisory/FG-IR-20-122

Affected products (1)

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

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