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CVE Record

CVE-2021-2423: Vulnerability in the Oracle Outside In Technology product of Oracle Fusion Middleware (component: Outside I...

Vulnerability in the Oracle Outside In Technology product of Oracle Fusion Middleware (component: Outside In Filters). The supported version that is affected is 8.5.5. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle Outside In Technology. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Outside In Technology. Note: Outside In Technology is a suite of software development kits (SDKs). The protocol and CVSS Base Score depend on the software that uses Outside In Technology. The CVSS score assumes that the software passes data received over a network directly to Outside In Technology, but if data is not received over a network the CVSS score may be lower. 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

Oracle Outside In Technology 8.5.5 has a high-severity denial-of-service flaw. If software feeds network data over HTTP directly into Outside In Filters, an unauthenticated attacker could make the component hang or repeatedly crash. The documented impact is availability loss, not data theft or modification.

Executive priority

Prioritize remediation where exposed services process network-supplied content through Outside In Technology. The business risk is service disruption, especially for systems relying on document or content processing availability.

Technical view

CVE-2021-2423 affects Oracle Outside In Technology 8.5.5, component Outside In Filters. The CVSS 3.1 score is 7.5 with AV:N/AC:L/PR:N/UI:N and A:H only. Oracle notes the protocol and score depend on the consuming software and may be lower when input is not network received.

Likely exposure

Exposure is limited to environments running software that embeds Oracle Outside In Technology 8.5.5. Risk is highest where that software accepts HTTP input and passes it directly to Outside In Technology for processing.

Exploitation context

The source says the issue is easily exploitable by an unauthenticated network attacker via HTTP. KEV is false, and the provided sources do not establish active exploitation or public weaponization.

Researcher notes

The provided record lacks CWE detail and does not describe a root cause. Testing should focus on asset identification, data-flow confirmation, version verification, and vendor advisory mapping rather than exploit reproduction.

Mitigation direction

  • Review Oracle July 2021 CPU guidance for this CVE.
  • Apply applicable Oracle or product-vendor updates for embedded Outside In Technology.
  • Restrict HTTP access to services feeding data into Outside In Filters.
  • Avoid sending untrusted network input directly into the affected component.
  • Monitor affected services for repeated hangs or crashes.

Validation and detection

  • Inventory products embedding Oracle Outside In Technology 8.5.5.
  • Confirm whether HTTP-received data reaches Outside In Filters.
  • Check vendor advisories for fixed versions or bundled updates.
  • Review availability logs for repeated crashes in affected processing services.
  • Reassess CVSS context if input is not network-originated.
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 · low confidence lookup

CVE-2021-2423 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
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-2021-2423Attack 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 CorporationOutside In Technology8.5.5Listed
Weakness

CWE details

No CWE listed

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