CVE-2021-20634

MEDIUMNVD 4.34.3—

4.3

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

CVSS v3: 4.3
EG Score: 4.3(medium)
EPSS: 45.6%
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/36865/
af854a3a-2127-422b-91ae-364da2661108https://jvn.jp/en/jp/JVN45797538/index.html
af854a3a-2127-422b-91ae-364da2661108https://kb.cybozu.support/article/36865/

Weakness Classification(1)

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

CWE-287Improper Authentication

Data Freshness Timeline

(refreshed 14× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-05 22:45 UTCepss_batch
2026-06-05 22:45 UTCepss_batch
2026-06-05 06:09 UTCepss_batch
2026-06-05 06:09 UTCepss_batch
2026-06-05 06:08 UTCepss_batch
2026-06-04 13:10 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 19:41 UTCEG score recompute
2026-05-26 19:41 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2021-20634?

CVE-2021-20634 is a medium vulnerability published on March 18, 2021. Improper access control vulnerability in Custom App of Cybozu Office 10.0.0 to 10.8.4 allows authenticated attackers to bypass access restriction and obtain the date of Custom App via unspecified vectors.

When was CVE-2021-20634 disclosed?

CVE-2021-20634 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-2021-20634 actively exploited?

CVE-2021-20634 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 45.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-20634?

CVE-2021-20634 has a CVSS v3 base score of 4.3 (NVD).

How do I remediate CVE-2021-20634?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-20634, 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-2021-20634

📅 Published

🔄 Last Modified

🔗 References (4)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-20634?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (4)

Frequently asked(5)

Related CVEs(same CWE)