Is CVE-2021-20788 in the CISA KEV catalog?

No. CVE-2021-20788 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-20788?

CVE-2021-20788 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2021-20788?

CVE-2021-20788 has an EPSS score of 0.92% (56th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-20788?

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

CVE & CISA-KEV Catalog

CVE-2021-20788

MEDIUM

4.3

CVSS v3

NVD

Description

Server-side request forgery (SSRF) 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 authenticated attacker to conduct a port scan from the product and/or obtain information from the internal Web server.

CWE-918Server-Side Request Forgery (SSRF)

How to fix

Remediation Available

groupsessionNVD

Affected:>= 2.20, < 5.1.0Fixed in:5.1.0CVE-2021-20788derived from NVD

groupsession bycloudNVD

Affected:>= 3.0.3, < 5.1.0Fixed in:5.1.0CVE-2021-20788derived from NVD

groupsession zionNVD

Affected:>= 3.0.3, < 5.1.0Fixed in:5.1.0CVE-2021-20788derived 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 RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.92%probability of exploitation in 30 days

56thpercentile

Moderate risk: more likely to be exploited than 56% of all known CVEs.

References

Vendor Advisory1

groupsession.jp

Third-Party Advisory1

jvn.jp

Related Vulnerabilities

Other CWE-918 (Server-Side Request Forgery (SSRF)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-21893	High	8.2	100%	KEV + Ransom	-
CVE-2021-40438	Critical	9.0	100%	KEV	Fix
CVE-2021-34473	Critical	9.1	100%	KEV + Ransom	Fix
CVE-2021-26855	Critical	9.1	100%	KEV + Ransom	Fix
CVE-2021-21985	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2022-41040	High	8.8	100%	KEV + Ransom	Fix

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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.