HOMEVULNERABILITIESCVE-2021-20758
HIGH

CVE-2021-20758

CWE-352Published: August 18, 2021· Updated: Jun 17, 2026

8.0
CVSS v3.1

Official Description

Cross-site request forgery (CSRF) vulnerability in Message of Cybozu Garoon 4.0.0 to 5.0.2 allows a remote authenticated attacker to hijack the authentication of administrators and perform an arbitrary operation via unspecified vectors.

NVD Source

Technical Analysis

CVE-2021-20758 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.0.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Affected Vendors & Products

cybozu1 product(s)
garoon
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://cs.cybozu.co.jp/2021/007206.html
ADVISORYhttps://jvn.jp/en/jp/JVN54794245/index.html
ADVISORYhttps://cs.cybozu.co.jp/2021/007206.html
ADVISORYhttps://jvn.jp/en/jp/JVN54794245/index.html

All References (4)

→
https://cs.cybozu.co.jp/2021/007206.htmlVendor Advisory
→
https://jvn.jp/en/jp/JVN54794245/index.htmlThird Party Advisory
→
https://cs.cybozu.co.jp/2021/007206.htmlVendor Advisory
→
https://jvn.jp/en/jp/JVN54794245/index.htmlThird Party Advisory

Quick Facts

CVE IDCVE-2021-20758
CVSS Score8.0 / 10
SeverityHIGH
WeaknessCWE-352
CISA KEVNo
Affected1 vendor(s)
PublishedAug 18, 2021

Related CVEs (CWE-352)

CVE-2017-5145
10.0
CVE-2025-32642
10.0
CVE-2025-23922
10.0
CVE-2017-16780
9.8
CVE-2023-4659
9.8
CVE-2023-43649
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-20758 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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