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CVE Record

CVE-2021-2136: 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 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 IIOP to compromise Oracle WebLogic Server. Successful attacks of this vulnerability can result in takeover of Oracle WebLogic Server. CVSS 3.1 Base Score 9.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

CriticalCVSS 9.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysiscritical

Security readout for executives and security teams

Plain-English summary

CVE-2021-2136 is a critical Oracle WebLogic Server flaw that can let an unauthenticated network attacker take over the server through IIOP access. For businesses, exposed affected WebLogic instances represent a direct risk to application control, hosted data, and service availability.

Executive priority

Prioritize this as critical for any affected WebLogic deployment, especially if reachable beyond tightly controlled internal networks. The business risk is server takeover, not a limited information leak.

Technical view

Oracle describes this as an easily exploitable WebLogic Server Core vulnerability reachable over the network via IIOP. Affected versions are 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 9.8 with high confidentiality, integrity, and availability impact.

Likely exposure

Exposure is most likely where affected WebLogic Server versions are deployed and IIOP is reachable from untrusted networks, partner networks, or broad internal segments. Internet-facing WebLogic environments should be treated as urgent until version and patch status are confirmed.

Exploitation context

The provided sources do not show CISA KEV listing or active exploitation evidence. However, Oracle rates the vulnerability as unauthenticated, network reachable, low complexity, and capable of full WebLogic Server takeover, which makes remediation time-sensitive.

Researcher notes

The bundle provides vendor and CVE-level facts but no exploit details, CWE mapping, or proof of active exploitation. Validation should focus on affected version discovery, IIOP reachability, and Oracle CPU remediation status without attempting offensive reproduction.

Mitigation direction

  • Apply Oracle April 2021 Critical Patch Update guidance or later applicable vendor patches.
  • Confirm affected WebLogic versions are upgraded or patched according to Oracle support guidance.
  • Restrict IIOP exposure to trusted networks where business use requires it.
  • Review perimeter and internal firewall rules for unnecessary WebLogic reachability.
  • Check Oracle advisories for version-specific prerequisites and supported remediation paths.

Validation and detection

  • Inventory WebLogic Server versions across production, staging, and legacy environments.
  • Identify whether IIOP is enabled and reachable from untrusted network paths.
  • Verify Oracle CPU April 2021 or later relevant fixes are installed.
  • Review asset exposure for internet-facing or partner-accessible WebLogic endpoints.
  • Document compensating controls if patching cannot be completed immediately.
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-2021-2136 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
Critical
CVSS
9.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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
9.8CVSS 3.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

9.8Critical
CVSS 3.1 vector shape for CVE-2021-2136Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 Server12.1.3.0.0, 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.