CVE-2021-20874

Name: CVE-2021-20874
Creator: NVD / NIST
Published: 2021-12-24T07:15:06.7+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.30%

Last modified Jun 17, 2026

CVE-2021-20874 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Incorrect permission assignment for critical resource vulnerability in GroupSession Free edition ver5.1.1 and earlier, GroupSession byCloud ver5.1.1 and earlier, and GroupSession ZION ver5.1.1 and earlier allows a remote unauthenticated attacker to access arbitrary files on the server and obtain sensitive information via unspecified vectors.. EPSS estimates a 1.30% chance of exploitation in the next 30 days.

Description

Incorrect permission assignment for critical resource vulnerability in GroupSession Free edition ver5.1.1 and earlier, GroupSession byCloud ver5.1.1 and earlier, and GroupSession ZION ver5.1.1 and earlier allows a remote unauthenticated attacker to access arbitrary files on the server and obtain sensitive information via unspecified vectors.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.30%

66.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-732

Affected Software

Vendor	Product	Versions
Groupsession	Groupsession	<= 5.1.1

References

https://groupsession.jp/info/info-news/security20211220Vendor Advisory
https://jvn.jp/en/jp/JVN79798166/index.htmlThird Party Advisory
https://groupsession.jp/info/info-news/security20211220Vendor Advisory
https://jvn.jp/en/jp/JVN79798166/index.htmlThird Party Advisory

Timeline

Published: Dec 24, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20874?

How severe is CVE-2021-20874?

CVE-2021-20874 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.30% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20874?

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-2021-20874?

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

Scan your code now

Source: NVD / NIST