How severe is CVE-2021-40214?

CVE-2021-40214 has a CVSS 3.x base score of 5.4, 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-2021-40214 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-40214?

CVE-2021-40214 affects Gibbonedu Gibbon. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-40214?

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

When was CVE-2021-40214 published?

CVE-2021-40214 was published on 2021-09-13 and last updated on 2026-06-17.

CVE-2021-40214

CVE-2021-40214 is a medium-severity vulnerability in Gibbonedu Gibbon with a CVSS 3.x base score of 5.4. 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 5.4)
CVSS v2: 3.5
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Gibbonedu Gibbon
Published: 2021-09-13
Last modified: 2026-06-17

Description

Gibbon v22.0.00 suffers from a stored XSS vulnerability within the wall messages component.

Frequently asked questions

What is CVE-2021-40214?: Gibbon v22.0.00 suffers from a stored XSS vulnerability within the wall messages component.
How severe is CVE-2021-40214?: CVE-2021-40214 has a CVSS 3.x base score of 5.4, 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-2021-40214 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-40214?: CVE-2021-40214 affects Gibbonedu Gibbon. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-40214?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-40214 published?: CVE-2021-40214 was published on 2021-09-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:gibbonedu:gibbon:22.0.00:*:*:*:*:*:*:*

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