Is CVE-2021-20786 in the CISA KEV catalog?

No. CVE-2021-20786 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-20786?

CVE-2021-20786 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2021-20786?

CVE-2021-20786 has an EPSS score of 0.45% (36th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-20786?

Upgrade groupsession to 5.1.0 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2021-20786

MEDIUM

4.3

CVSS v3

NVD

Description

Cross-site request forgery (CSRF) vulnerability in GroupSession (GroupSession Free edition from ver2.2.0 to the version prior to ver5.1.0, GroupSession byCloud from ver3.0.3 to the version prior to ver5.1.0, and GroupSession ZION from ver3.0.3 to the version prior to ver5.1.0) allows a remote attacker to hijack the authentication of administrators via a specially crafted URL.

CWE-352Cross-Site Request Forgery

How to fix

Remediation Available

groupsessionNVD

Affected:>= 2.20, < 5.1.0Fixed in:5.1.0CVE-2021-20786derived from NVD

groupsession bycloudNVD

Affected:>= 3.0.3, < 5.1.0Fixed in:5.1.0CVE-2021-20786derived from NVD

groupsession zionNVD

Affected:>= 3.0.3, < 5.1.0Fixed in:5.1.0CVE-2021-20786derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

0.45%probability of exploitation in 30 days

36thpercentile

Low risk: more likely to be exploited than 36% of all known CVEs.

References

Vendor Advisory1

groupsession.jp

Third-Party Advisory1

jvn.jp

Related Vulnerabilities

Other CWE-352 (Cross-Site Request Forgery) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2016-6277	High	8.8	100%	KEV	-
CVE-2014-0054	Medium	6.8	91%	-	Fix
CVE-2013-6429	Medium	6.8	90%	-	Fix
CVE-2022-41622	High	8.8	88%	-	-
CVE-2018-7700	High	8.8	75%	-	-
CVE-2015-2295	Medium	6.8	66%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.