How severe is CVE-2021-20628?

CVE-2021-20628 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-2021-20628 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20628?

CVE-2021-20628 affects Cybozu Office. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-20628?

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

When was CVE-2021-20628 published?

CVE-2021-20628 was published on 2021-03-18 and last updated on 2026-06-17.

CVE-2021-20628

CVE-2021-20628 is a medium-severity vulnerability in Cybozu Office with a CVSS 3.x base score of 6.1. 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 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (52nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Cybozu Office
Published: 2021-03-18
Last modified: 2026-06-17

Description

Cross-site scripting vulnerability in Address Book of Cybozu Office 10.0.0 to 10.8.4 allows remote attackers to inject an arbitrary script via unspecified vectors. Note that this vulnerability occurs only when using Mozilla Firefox.

Frequently asked questions

What is CVE-2021-20628?: Cross-site scripting vulnerability in Address Book of Cybozu Office 10.0.0 to 10.8.4 allows remote attackers to inject an arbitrary script via unspecified vectors. Note that this vulnerability occurs only when using Mozilla Firefox.
How severe is CVE-2021-20628?: CVE-2021-20628 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-2021-20628 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20628?: CVE-2021-20628 affects Cybozu Office. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-20628?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-20628 published?: CVE-2021-20628 was published on 2021-03-18 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:cybozu:office:*:*:*:*:*:*:*:*

More vulnerabilities in Cybozu Office

CVE-2014-5314 — Critical (CVSS 9.0): Buffer overflow in Cybozu Office 9 and 10 before 10.1.0, Mailwise 4 and 5 before 5.1.4, and Dezie 8 before 8.1.1 allows…
CVE-2016-1151 — High (CVSS 8.8): Multiple cross-site request forgery (CSRF) vulnerabilities in Cybozu Office 9.9.0 through 10.3.0 allow remote attackers…
CVE-2018-0704 — High (CVSS 7.5): Directory traversal vulnerability in Cybozu Office 10.0.0 to 10.8.1 allows remote attackers to delete arbitrary files…
CVE-2018-0703 — High (CVSS 7.5): Directory traversal vulnerability in Cybozu Office 10.0.0 to 10.8.1 allows remote attackers to delete arbitrary files…
CVE-2015-8483 — High (CVSS 7.4): Open redirect vulnerability in Cybozu Office 10.2.0 through 10.3.0 allows remote attackers to redirect users to…
CVE-2024-39817 — Medium (CVSS 6.5): Insertion of sensitive information into sent data issue exists in Cybozu Office 10.0.0 to 10.8.6, which may allow a…

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