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CVE-2021-20795

26
FAUCET Score

CVE-2021-20795 is a high-severity Cross-Site Request Forgery (CSRF) vulnerability affecting Cybozu Remote Service versions 3.1.8 to 3.1.9. This flaw allows a remote attacker to hijack an administrator's authenticated session, potentially leading to unauthorized operations and full compromise of confidentiality, integrity, and availability. The attack requires user interaction (UI:R) but can be executed over the network (AV:N) with low attack complexity (AC:L). Currently, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
3.1.8CPE matchmatch criteria
cpe:2.3:a:cybozu:remote_service_manager:3.1.8:*:*:*:*:*:*:*
3.1.9CPE matchmatch criteria
cpe:2.3:a:cybozu:remote_service_manager:3.1.9:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.54%
Probability of exploitation in next 30 days
EPSS Percentile
42.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0054 is in the 44th percentile among its peer group of 14,875 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

jvn.jp / en/jp/JVN52694228/index.html
Third Party Advisory
kb.cybozu.support / article/37422
Vendor Advisory