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CVE Record

CVE-2021-2378: 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 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

CVE-2021-2378 is a denial-of-service vulnerability in Oracle WebLogic Server. An unauthenticated network attacker can cause the server to hang or crash repeatedly, disrupting applications that depend on WebLogic. The published impact is availability only, not data theft or code execution.

Executive priority

Treat this as a high-priority availability risk for business-critical WebLogic applications. It is not described as data compromise, but unauthenticated remote service disruption can still create material operational impact.

Technical view

Oracle describes this as a Core component flaw in WebLogic Server, exploitable over T3 or IIOP with low complexity and no credentials or user interaction. A successful attack can cause a complete denial of service. Affected versions 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.

Likely exposure

Exposure is most likely where affected WebLogic instances accept network traffic on T3 or IIOP from untrusted or broad internal networks. Internet-facing or partner-facing middleware environments carry higher business risk because availability disruption can affect dependent enterprise applications.

Exploitation context

The provided sources do not show CISA KEV listing or confirmed active exploitation. Oracle rates the issue CVSS 7.5 because it is remotely reachable, unauthenticated, low complexity, and can cause high availability impact.

Researcher notes

Focus validation on version, patch level, and protocol exposure. The public description does not provide CWE, root cause details, exploit artifacts, or proof of active exploitation, so avoid assuming broader impact than complete denial of service.

Mitigation direction

  • Apply the applicable Oracle July 2021 CPU or later supported WebLogic security update.
  • Prioritize affected WebLogic systems reachable over T3 or IIOP from untrusted networks.
  • Restrict T3 and IIOP access to required trusted peers where operationally possible.
  • Move unsupported WebLogic versions to supported, patchable releases.
  • Monitor Oracle advisories for version-specific remediation guidance.

Validation and detection

  • Inventory WebLogic Server versions across production, disaster recovery, and staging environments.
  • Confirm whether versions match the affected list in Oracle and CVE records.
  • Review network exposure for T3 and IIOP listeners on WebLogic hosts.
  • Verify installed Oracle CPU or later security patch level.
  • Check availability logs for unexplained repeated crashes or hangs.
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-2021-2378 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-2021-2378Attack 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.