CVE-2021-20633

MEDIUMNVD 4.34.3—

4.3

Improper access control vulnerability in Cabinet of Cybozu Office 10.0.0 to 10.8.4 allows authenticated attackers to bypass access restriction and obtain the date of Cabinet via unspecified vectors.

CVSS v3: 4.3
EG Score: 4.3(medium)
EPSS: 45.5%
KEV: Not listed

Published

March 18, 2021

Last Modified

November 21, 2024

References (4)

vultures@jpcerthttps://jvn.jp/en/jp/JVN45797538/index.html
vultures@jpcerthttps://kb.cybozu.support/article/36869/
af854a3a-2127-422b-91ae-364da2661108https://jvn.jp/en/jp/JVN45797538/index.html
af854a3a-2127-422b-91ae-364da2661108https://kb.cybozu.support/article/36869/

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-863Incorrect Authorization

Data Freshness Timeline

(refreshed 13× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-08 14:15 UTCEPSS rescore
2026-06-08 14:15 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-05 06:08 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore

Frequently asked(5)

What is CVE-2021-20633?

CVE-2021-20633 is a medium vulnerability published on March 18, 2021. Improper access control vulnerability in Cabinet of Cybozu Office 10.0.0 to 10.8.4 allows authenticated attackers to bypass access restriction and obtain the date of Cabinet via unspecified vectors.

When was CVE-2021-20633 disclosed?

CVE-2021-20633 was first published in the National Vulnerability Database on March 18, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-20633 actively exploited?

CVE-2021-20633 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 45.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-20633?

CVE-2021-20633 has a CVSS v3 base score of 4.3 (NVD).

How do I remediate CVE-2021-20633?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-20633, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2021-20633

📅 Published

🔄 Last Modified

🔗 References (4)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-20633?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (4)

Frequently asked(5)

Related CVEs(same CWE)