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CVE Record

CVE-2020-2820: Vulnerability in the Oracle Common Applications Calendar product of Oracle E-Business Suite (component: Not...

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 and 12.2.3-12.2.8. 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).

HighCVSS 8.2Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

An affected Oracle E-Business Suite Calendar Notes component can let an unauthenticated remote attacker, after user interaction, access critical calendar data and modify some accessible data. The issue is high severity because it is network-reachable over HTTP and may affect other connected products.

Executive priority

Treat this as a high-priority Oracle E-Business Suite remediation item, especially for externally reachable systems, because the flaw can expose critical business data and enable unauthorized data changes.

Technical view

CVE-2020-2820 affects Oracle Common Applications Calendar, component Notes, in E-Business Suite versions 12.1.1-12.1.3 and 12.2.3-12.2.8. CVSS 3.0 is 8.2: AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N. Impact is primarily confidentiality, with limited integrity impact and no stated availability impact.

Likely exposure

Organizations running affected Oracle E-Business Suite versions with Common Applications Calendar reachable over HTTP are the main exposure group. Internet-facing or broadly accessible internal EBS deployments carry higher business risk.

Exploitation context

The source bundle does not show CISA KEV listing or confirmed active exploitation. Exploitation is described as easy, unauthenticated, network-based over HTTP, but requiring interaction from a user other than the attacker.

Researcher notes

The public record does not provide CWE mapping, exploit details, or standalone mitigation text. Analysis should stay tied to Oracle CPU guidance, affected version confirmation, and exposure of the Calendar Notes component.

Mitigation direction

  • Review Oracle April 2020 CPU guidance for CVE-2020-2820 and affected E-Business Suite versions.
  • Apply the applicable Oracle E-Business Suite security updates or vendor-recommended remediation.
  • Limit HTTP access to E-Business Suite Calendar interfaces to trusted networks where feasible.
  • Prioritize remediation for internet-facing or broadly reachable EBS deployments.
  • Monitor Oracle guidance for any later corrections, prerequisites, or patch dependencies.

Validation and detection

  • Inventory Oracle E-Business Suite instances and confirm exact application release levels.
  • Check whether versions 12.1.1-12.1.3 or 12.2.3-12.2.8 are present.
  • Confirm whether Common Applications Calendar and Notes functionality is enabled and reachable over HTTP.
  • Verify Oracle CPU patch status against vendor documentation for each affected instance.
  • Review access logs for unusual HTTP activity targeting Calendar or Notes functionality.
Prepared
Confidence
medium
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2020-2820 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
8.2 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
8.2CVSS 3.0HighCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N2.84.7Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

8.2High
CVSS 3.0 vector shape for CVE-2020-2820Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Oracle CorporationCommon Applications Calendar12.1.1-12.1.3, 12.2.3-12.2.8Listed
Weakness

CWE details

No CWE listed

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