How severe is CVE-2021-43080?

CVE-2021-43080 has a CVSS 3.x base score of 4.6, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-43080 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-43080?

CVE-2021-43080 primarily affects Fortinet Fortios. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-43080?

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

When was CVE-2021-43080 published?

CVE-2021-43080 was published on 2022-09-06 and last updated on 2026-06-17.

CVE-2021-43080

CVE-2021-43080 is a medium-severity vulnerability in Fortinet Fortios with a CVSS 3.x base score of 4.6. 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 4.6)
EPSS exploit prediction: 0% (29th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Fortinet Fortios
Published: 2022-09-06
Last modified: 2026-06-17

Description

An improper neutralization of input during web page generation vulnerability [CWE-79] in FortiOS version 7.2.0, version 6.4.0 through 6.4.9, version 7.0.0 through 7.0.5 may allow an authenticated attacker to perform a stored cross site scripting (XSS) attack through the URI parameter via the Threat Feed IP address section of the Security Fabric External connectors.

Frequently asked questions

What is CVE-2021-43080?: An improper neutralization of input during web page generation vulnerability [CWE-79] in FortiOS version 7.2.0, version 6.4.0 through 6.4.9, version 7.0.0 through 7.0.5 may allow an authenticated attacker to perform a stored cross site scripting (XSS) attack through the URI parameter via the Threat Feed IP address section of the Security Fabric External connectors.
How severe is CVE-2021-43080?: CVE-2021-43080 has a CVSS 3.x base score of 4.6, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-43080 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-43080?: CVE-2021-43080 primarily affects Fortinet Fortios. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-43080?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-43080 published?: CVE-2021-43080 was published on 2022-09-06 and last updated on 2026-06-17.

References

https://fortiguard.com/psirt/FG-IR-21-222

Affected products (2)

cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:7.2.0:*:*:*:*:*:*:*

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