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CVE-2021-20874

25
FAUCET Score

CVE-2021-20874 is an incorrect permission assignment vulnerability affecting GroupSession Free, byCloud, and ZION editions prior to version 5.1.1. This flaw allows a remote, unauthenticated attacker to access arbitrary files and sensitive information on the server. With a CVSS score of 7.5 (HIGH), it is easily exploitable over the network with low attack complexity, leading to high confidentiality impact. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
<= 5.1.1CPE matchmatch criteria
cpe:2.3:a:groupsession:groupsession:*:*:*:*:cloud:*:*:*
<= 5.1.1CPE matchmatch criteria
cpe:2.3:a:groupsession:groupsession:*:*:*:*:free:*:*:*
<= 5.1.1CPE matchmatch criteria
cpe:2.3:a:groupsession:groupsession:*:*:*:*:zion:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.30%
Probability of exploitation in next 30 days
EPSS Percentile
67.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0130 is in the 47th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

groupsession.jp / info/info-news/security20211220
Vendor Advisory
jvn.jp / en/jp/JVN79798166/index.html
Third Party Advisory