CVE-2020-2823 in Common Applications Calendar
Summary
by MITRE
Vulnerability in the Oracle Common Applications Calendar product of Oracle E-Business Suite (component: Notes). Supported versions that are affected are 12.1.1-12.1.3. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle Common Applications Calendar. Successful attacks require human interaction from a person other than the attacker and while the vulnerability is in Oracle Common Applications Calendar, attacks may significantly impact additional products. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Oracle Common Applications Calendar accessible data as well as unauthorized update, insert or delete access to some of Oracle Common Applications Calendar accessible data. CVSS 3.0 Base Score 8.2 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N).
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Analysis
by VulDB Data Team • 05/08/2025
The vulnerability identified as CVE-2020-2823 resides within Oracle Common Applications Calendar component of the Oracle E-Business Suite, specifically affecting versions 12.1.1 through 12.1.3. This flaw represents a critical security weakness that enables unauthenticated attackers to compromise the calendar functionality through HTTP network connections. The vulnerability's classification as easily exploitable indicates that attackers require minimal technical expertise to leverage this weakness, making it particularly dangerous in production environments where such systems are often accessible over networks.
The technical nature of this vulnerability stems from insufficient authentication and authorization controls within the Notes component of Oracle Common Applications Calendar. Attackers can exploit this weakness by sending specially crafted HTTP requests that bypass normal access controls, potentially gaining unauthorized access to calendar data. The CVSS 3.0 score of 8.2 reflects the severity of impact, with high confidentiality impact and low integrity impact, indicating that attackers can access sensitive calendar information without necessarily modifying it. The vulnerability's attack vector requires network access via HTTP, meaning that systems exposed to external networks are particularly at risk.
The operational impact of this vulnerability extends beyond the immediate calendar component, as successful exploitation can compromise additional Oracle E-Business Suite products that share underlying infrastructure or data repositories. This cascading effect means that a single vulnerability can potentially provide access to multiple interconnected systems within the enterprise environment. The requirement for human interaction from a person other than the attacker suggests that social engineering or user-based attacks may be necessary to trigger the vulnerability, though the underlying flaw itself remains accessible to unauthenticated network access. This characteristic places organizations at risk when users interact with calendar systems that may have been compromised.
Organizations should implement immediate mitigations including network segmentation to limit access to Oracle E-Business Suite components, deployment of web application firewalls to monitor and filter HTTP traffic, and application-level controls to restrict calendar access. The vulnerability's classification under CWE-287 (Improper Authentication) aligns with common attack patterns documented in the ATT&CK framework, specifically targeting credential dumping and privilege escalation techniques. Regular security assessments and vulnerability scanning should be implemented to detect similar weaknesses in other Oracle components. Additionally, organizations should review and update their incident response procedures to address potential data compromise scenarios, as the confidentiality impact of this vulnerability could expose sensitive calendar information including personal schedules, business meetings, and potentially confidential communications. The CVSS vector indicates that while the attack requires user interaction, the potential for significant data exposure makes this vulnerability a high-priority remediation target for enterprise security teams.