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CVE Record

CVE-2021-2376: Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Web Services).

Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Web Services). 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 T3, IIOP to compromise Oracle WebLogic Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle WebLogic Server. CVSS 3.1 Base Score 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

HighCVSS 7.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

This flaw lets an unauthenticated network attacker crash or hang affected Oracle WebLogic Server instances. The business risk is service outage, not data theft or direct system takeover based on the cited CVSS impacts.

Executive priority

Treat this as a high-priority availability risk for business-critical WebLogic services. It does not indicate data compromise by itself, but outage potential justifies prompt patch validation and network exposure review.

Technical view

CVE-2021-2376 affects Oracle WebLogic Server Web Services in 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. It is network-reachable over T3 and IIOP, requires no privileges or user interaction, and has high availability impact.

Likely exposure

Exposure is most likely where affected WebLogic versions are reachable over network paths that allow T3 or IIOP. Internet-facing, partner-facing, or broadly internal middleware environments should be prioritized.

Exploitation context

The source bundle does not show CISA KEV listing or cited active exploitation. Oracle describes the issue as easily exploitable by an unauthenticated attacker with network access via T3 or IIOP.

Researcher notes

The cited CVSS vector is AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Analysis should stay focused on denial of service through exposed T3 or IIOP paths; the sources do not support claiming confidentiality or integrity impact.

Mitigation direction

  • Review and apply Oracle July 2021 CPU guidance for affected WebLogic Server versions.
  • Prioritize systems exposing T3 or IIOP beyond tightly controlled administrative networks.
  • Restrict network access to WebLogic services where business requirements allow.
  • Monitor affected environments for repeated crashes, hangs, or unexplained availability drops.
  • Check current Oracle guidance before relying on compensating controls alone.

Validation and detection

  • Inventory WebLogic Server versions across production, staging, and disaster recovery environments.
  • Confirm whether T3 or IIOP is reachable from untrusted or broad internal networks.
  • Verify patch status against Oracle July 2021 CPU records and asset management data.
  • Review service monitoring for recurring WebLogic crashes or hangs.
  • Retest availability and application workflows after remediation in a controlled window.
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-2021-2376 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

7.5High
CVSS 3.1 vector shape for CVE-2021-2376Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.