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CVE Record

CVE-2021-35660: 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

This flaw can let an unauthenticated remote attacker crash or hang software that uses Oracle Outside In Technology 8.5.5 to process network-supplied content. The known impact is service outage, not data theft or code execution, based on the provided sources.

Executive priority

Treat this as a high-priority availability risk for systems that process external documents or content through Oracle Outside In. Prioritize internet-facing or business-critical services first. Urgency is lower where the SDK is absent, patched, or not exposed to network-supplied input.

Technical view

CVE-2021-35660 affects Oracle Outside In Technology 8.5.5, component Outside In Filters. Oracle rates it CVSS 7.5: network, low complexity, no privileges, no user interaction, unchanged scope, high availability impact only. Oracle notes actual protocol and score depend on the embedding application.

Likely exposure

Exposure is most likely where an application embeds Oracle Outside In Technology 8.5.5 and passes HTTP-received data directly into Outside In Filters. The source bundle does not identify downstream Oracle or third-party products that include the SDK.

Exploitation context

The provided data does not show active exploitation, and the CVE is not marked KEV. The issue is described as easily exploitable over HTTP without authentication when the host application exposes network content processing.

Researcher notes

The important scoping question is not only version 8.5.5, but how the embedding application feeds data into the SDK. The CVSS assumes direct network-to-Outside-In processing; Oracle states the protocol and score may be lower in other designs.

Mitigation direction

  • Identify applications and services embedding Oracle Outside In Technology 8.5.5.
  • Review Oracle's October 2021 Critical Patch Update and current vendor guidance.
  • Apply supported Oracle or application-vendor updates where applicable.
  • Reduce direct network exposure to file-processing endpoints where feasible.
  • Monitor affected services for repeated crashes or hangs.

Validation and detection

  • Inventory Outside In SDK versions in deployed applications.
  • Confirm whether HTTP-supplied content is processed by Outside In Filters.
  • Check patch status against Oracle CPU October 2021 guidance.
  • Review logs and uptime data for repeatable crashes or hangs.
  • Confirm compensating controls protect exposed processing endpoints.
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-2021-35660 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-2021-35660Attack 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.