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CVE Record

CVE-2021-2156: Vulnerability in the Oracle Customers Online product of Oracle E-Business Suite (component: Customer Tab).

Vulnerability in the Oracle Customers Online product of Oracle E-Business Suite (component: Customer Tab). Supported versions that are affected are 12.1.3 and 12.2.3-12.2.10. Easily exploitable vulnerability allows low privileged attacker with network access via HTTP to compromise Oracle Customers Online. Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Oracle Customers Online accessible data as well as unauthorized access to critical data or complete access to all Oracle Customers Online accessible data. CVSS 3.1 Base Score 8.1 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N).

HighCVSS 8.1Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

Oracle E-Business Suite Customers Online has a high-severity flaw that can let a low-privileged HTTP user read or change critical customer data. The main business risk is unauthorized access, creation, modification, or deletion of data inside Customers Online.

Executive priority

Prioritize this for any internet- or broadly accessible E-Business Suite deployment. The risk is not service outage; it is customer data confidentiality and integrity loss through an authenticated, low-complexity HTTP attack path.

Technical view

CVE-2021-2156 affects Oracle Customers Online, Customer Tab, in E-Business Suite versions 12.1.3 and 12.2.3 through 12.2.10. It is network-exploitable over HTTP with low privileges and no user interaction. CVSS 3.1 score is 8.1, with high confidentiality and integrity impact and no availability impact stated.

Likely exposure

Exposure is most likely in organizations running Oracle E-Business Suite with Customers Online enabled on affected 12.1.3 or 12.2.3-12.2.10 versions, especially where authenticated low-privileged users can reach the application over HTTP.

Exploitation context

The source bundle does not show CISA KEV listing or cited evidence of active exploitation. Oracle describes the vulnerability as easily exploitable by a low-privileged attacker with HTTP network access, so authenticated access materially lowers the barrier.

Researcher notes

No CWE is supplied in the bundle. The CVSS vector is AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N. Keep analysis scoped to Oracle Customers Online Customer Tab and the listed E-Business Suite versions; the bundle does not substantiate broader product impact or exploit availability.

Mitigation direction

  • Review Oracle April 2021 Critical Patch Update guidance for this CVE.
  • Apply applicable Oracle E-Business Suite vendor patches after confirming version exposure.
  • Restrict HTTP access to Customers Online to trusted users and networks.
  • Review low-privileged accounts with access to Customers Online.
  • Monitor for unexpected customer data reads, creations, changes, or deletions.

Validation and detection

  • Inventory Oracle E-Business Suite versions and Customers Online usage.
  • Confirm whether versions are 12.1.3 or 12.2.3 through 12.2.10.
  • Check patch status against Oracle CPU April 2021 guidance.
  • Verify low-privileged user access paths to the Customer Tab.
  • Review audit logs for unusual Customers Online data activity.
Prepared
Confidence
high
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-2021-2156 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
8.1 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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
8.1CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N2.85.2Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

8.1High
CVSS 3.1 vector shape for CVE-2021-2156Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 CorporationCustomers Online12.1.3, 12.2.3-12.2.10Listed
Weakness

CWE details

No CWE listed

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