What is CVE-2021-20875?

CVE-2021-20875 is a medium-severity vulnerability in Groupsession, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2021-12-24.

How severe is CVE-2021-20875?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Open Redirect in Groupsession

CVE-2021-20875

Open redirect 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 redirect users to arbitrary web sites and conduct phishing attacks by having a user to access a specially crafted URL.

Vulnerability class: Open Redirect

EPSS: 0.008 (53.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Groupsession
Japan Total System Co.,ltd. Groupsession Free Edition, Bycloud, Zion — versions GroupSession Free edition ver5.1.1 and earlier, GroupSession byCloud ver5.1.1 and earlier, and GroupSession ZION ver5.1.1 and earlier

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

vultures@jpcert.or.jp (x_refsource_MISC, Vendor Advisory)
vultures@jpcert.or.jp (Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-20875?: CVE-2021-20875 is a medium-severity vulnerability in Groupsession, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2021-12-24.
How severe is CVE-2021-20875?: Medium severity. CVSS v3 base score is 6.1 out of 10.