How severe is CVE-2021-24021?

CVE-2021-24021 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2021-24021 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-24021?

CVE-2021-24021 affects Fortinet Fortianalyzer. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-24021?

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

When was CVE-2021-24021 published?

CVE-2021-24021 was published on 2021-10-06 and last updated on 2026-06-17.

CVE-2021-24021

CVE-2021-24021 is a medium-severity vulnerability in Fortinet Fortianalyzer with a CVSS 3.x base score of 4.3. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v2: 3.5
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Fortinet Fortianalyzer
Published: 2021-10-06
Last modified: 2026-06-17

Description

An improper neutralization of input vulnerability [CWE-79] in FortiAnalyzer versions 6.4.3 and below, 6.2.7 and below and 6.0.10 and below may allow a remote authenticated attacker to perform a stored cross site scripting attack (XSS) via the column settings of Logview in FortiAnalyzer, should the attacker be able to obtain that POST request, via other, hypothetical attacks.

Frequently asked questions

What is CVE-2021-24021?: An improper neutralization of input vulnerability [CWE-79] in FortiAnalyzer versions 6.4.3 and below, 6.2.7 and below and 6.0.10 and below may allow a remote authenticated attacker to perform a stored cross site scripting attack (XSS) via the column settings of Logview in FortiAnalyzer, should the attacker be able to obtain that POST request, via other, hypothetical attacks.
How severe is CVE-2021-24021?: CVE-2021-24021 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2021-24021 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-24021?: CVE-2021-24021 affects Fortinet Fortianalyzer. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-24021?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-24021 published?: CVE-2021-24021 was published on 2021-10-06 and last updated on 2026-06-17.

References

https://fortiguard.com/advisory/FG-IR-20-098

Affected products (1)

cpe:2.3:a:fortinet:fortianalyzer:*:*:*:*:*:*:*:*

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