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CVE-2021-20788

MEDIUM
4.3
CVSS Score
Published: July 28, 2021 at 12:45 AM UTC
Updated: June 17, 2026 at 03:34 AM UTC
4 products affected across 2 vendorsGroupsessionGroupsession ZionGroupsession Bycloud

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Severity
MEDIUM4.3
Exploit prediction
EPSS 0.9%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Groupsession· Groupsession
95%
2.20 ≤ v < 5.1.0
Affected range stops below 5.1.0, so it looks safe — our inference, not a vendor statement
Groupsession Bycloud· Groupsession
95%
3.0.3 ≤ v < 5.1.0
Affected range stops below 5.1.0, so it looks safe — our inference, not a vendor statement
Groupsession Zion· Groupsession
95%
3.0.3 ≤ v < 5.1.0
Affected range stops below 5.1.0, so it looks safe — our inference, not a vendor statement
GroupSession· Japan Total System
60%
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

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCVendor Advisory
Source: [email protected]
https://groupsession.jp/info/info-news/security202107
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://jvn.jp/en/jp/JVN86026700/index.html

CVSS

4.3MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-918

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