Remote Service Manager
CVE-2021-20803
MEDIUM
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V8 - Authorization Authorization logic validation
MITRE ATT&CK
1 technique across 1 tactic: Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS score of 5.4 (MEDIUM). Attack characteristics: network attack vector, low complexity, low privileges required, no user interaction not required. |
| Exploit ScenarioDerived | A remote attacker could bypass authorization checks to access restricted resources by sending crafted requests to the affected application. |
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Alert meAnalysisAI
Operation restriction bypass in the management screen of Cybozu Remote Service 3.1.8 to 3.1.9 allows a remote authenticated attacker to alter the data of the management screen. Rated medium severity (CVSS 5.4), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.
RemediationAI
No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Review and test authorization logic, implement consistent access control checks, use centralized authorization framework.
Affects your stack
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Technical ContextAI · show details
This vulnerability is classified as Incorrect Authorization (CWE-863), which allows attackers to bypass authorization checks to access restricted resources. Operation restriction bypass in the management screen of Cybozu Remote Service 3.1.8 to 3.1.9 allows a remote authenticated attacker to alter the data of the management screen. Affected products include: Cybozu Remote Service Manager.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
DescriptionNVD
Operation restriction bypass in the management screen of Cybozu Remote Service 3.1.8 to 3.1.9 allows a remote authenticated attacker to alter the data of the management screen.
Threat Intelligence Overview
NVD
CVE.org
EPSS
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.
Affected Products (CPE)NVD
More in Remote Service Manager
View allCross-site request forgery (CSRF) vulnerability in the management screen of Cybozu Remote Service 3.1.8 to 3.1.9 allows
Unspecified vulnerability in Cybozu Remote Service Manager through 2.3.0 and 3.x before 3.1.1 allows remote attackers to
Algorithmic complexity vulnerability in Cybozu Remote Service Manager through 2.3.0 and 3.x through 3.1.2 allows remote
Session fixation vulnerability in the management screen in Cybozu Remote Service Manager through 2.3.0 and 3.x before 3.
Cybozu Remote Service 3.1.8 to 3.1.9 allows a remote authenticated attacker to cause a denial of service (DoS) condition
Cybozu Remote Service 3.1.8 to 3.1.9 allows a remote authenticated attacker to conduct XML External Entity (XXE) attacks
Directory traversal vulnerability in the management screen of Cybozu Remote Service 3.1.8 allows a remote authenticated
Cross-site scripting vulnerability in the management screen of Cybozu Remote Service 3.0.0 to 3.1.9 allows a remote atta
Open redirect vulnerability in Cybozu Remote Service 3.0.0 to 3.1.9 allows remote attackers to redirect users to arbitra
Cross-site scripting vulnerability in the management screen of Cybozu Remote Service 3.1.7 to 3.1.9 allows a remote auth
Cross-site scripting vulnerability in the management screen of Cybozu Remote Service 3.1.8 allows a remote authenticated
Cross-site scripting vulnerability in the management screen of Cybozu Remote Service 3.1.8 to 3.1.9 allows a remote auth
GitHub PoC
Exploit-DB