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CVE Record

CVE-2021-2403: Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Core).

Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Core). Supported versions that are affected are 10.3.6.0.0, 12.1.3.0.0, 12.2.1.3.0, 12.2.1.4.0 and 14.1.1.0.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle WebLogic Server. Successful attacks of this vulnerability can result in unauthorized read access to a subset of Oracle WebLogic Server accessible data. CVSS 3.1 Base Score 5.3 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).

MediumCVSS 5.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

Oracle WebLogic Server has a remotely reachable flaw that can let an unauthenticated attacker read some server-accessible data over HTTP. The scored impact is confidentiality only, but exposed WebLogic systems often support critical applications, so affected versions should be addressed through Oracle guidance.

Executive priority

Treat as a scheduled but prompt remediation item, with higher priority for internet-facing WebLogic. The issue is not rated critical and only affects confidentiality in the CVSS data, but unauthenticated HTTP reachability makes exposed systems important to close.

Technical view

CVE-2021-2403 affects Oracle WebLogic Server Core versions 10.3.6.0.0, 12.1.3.0.0, 12.2.1.3.0, 12.2.1.4.0, and 14.1.1.0.0. CVSS 3.1 is 5.3: network attack vector, low complexity, no privileges, no user interaction, low confidentiality impact, no integrity or availability impact.

Likely exposure

Exposure is most likely where affected WebLogic Server instances are reachable over HTTP from untrusted networks or broad internal networks. Internet-facing management, application, or middleware endpoints increase urgency.

Exploitation context

The source bundle says the issue is easily exploitable by an unauthenticated network attacker over HTTP. It does not provide exploit details, and KEV status is false, so there is no source-supported evidence here of known active exploitation.

Researcher notes

The available record does not name a CWE, root cause, proof of concept, or specific fixed build. Avoid inferring affected products beyond Oracle WebLogic Server. Validation should focus on version inventory, patch state, and HTTP exposure rather than exploit reproduction.

Mitigation direction

  • Identify all Oracle WebLogic Server deployments and versions.
  • Review Oracle's July 2021 Critical Patch Update guidance.
  • Apply applicable Oracle WebLogic security updates for affected versions.
  • Restrict HTTP access to trusted networks where business allows.
  • Prioritize internet-facing and externally reachable WebLogic instances.

Validation and detection

  • Confirm whether WebLogic versions match the affected version list.
  • Verify applicable Oracle CPU patches are installed.
  • Map which WebLogic HTTP endpoints are internet or partner reachable.
  • Review security monitoring for unusual unauthorized read activity.
  • Document exceptions and compensating network controls.
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-2021-2403 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.3 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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
5.3CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N3.91.4Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

5.3Medium
CVSS 3.1 vector shape for CVE-2021-2403Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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 CorporationWebLogic Server10.3.6.0.0, 12.1.3.0.0, 12.2.1.3.0, 12.2.1.4.0, 14.1.1.0.0Listed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.