CVE-2021-20630

Name: CVE-2021-20630
Creator: NVD / NIST
Published: 2021-03-18T01:15:11.95+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.72%

Last modified Jun 17, 2026

CVE-2021-20630 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. Improper access control vulnerability in Phone Messages of Cybozu Office 10.0.0 to 10.8.4 allows authenticated attackers to bypass access restriction and obtain the data of Phone Messages via unspecified vectors.. EPSS estimates a 0.72% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

4.3/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS Probability

0.72%

49.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Cybozu	Office	>= 10.0.0, <= 10.8.4

References

https://jvn.jp/en/jp/JVN45797538/index.htmlThird Party Advisory
https://kb.cybozu.support/article/36872/Vendor Advisory
https://jvn.jp/en/jp/JVN45797538/index.htmlThird Party Advisory
https://kb.cybozu.support/article/36872/Vendor Advisory

Timeline

Published: Mar 18, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20630?

How severe is CVE-2021-20630?

CVE-2021-20630 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.72% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20630?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-20630?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST