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CVE Record

CVE-2021-35656: 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 network attacker crash or hang software that uses Oracle Outside In Technology 8.5.5 to process data received over HTTP. The known impact is availability loss, not data theft or code execution.

Executive priority

Treat as a high-priority availability risk for exposed document-processing services. It should be remediated promptly where Outside In 8.5.5 is internet-facing or business-critical.

Technical view

CVE-2021-35656 affects Oracle Outside In Technology 8.5.5, specifically Outside In Filters. Oracle describes it as easily exploitable over HTTP with no privileges or user interaction when a consuming application passes network data directly into the SDK. CVSS is 7.5 with high availability impact only.

Likely exposure

Exposure is most likely in applications or commercial products embedding Oracle Outside In Technology 8.5.5, especially services that process uploaded, emailed, or HTTP-delivered files through Outside In Filters.

Exploitation context

The provided sources do not show active exploitation, and the CVE is not listed as KEV. The attack path is unauthenticated, network-accessible, and low complexity, but the documented result is denial of service.

Researcher notes

The CVSS score assumes network data is passed directly to Outside In Technology. If the SDK is used only on local or trusted data paths, practical severity may be lower. Sources do not provide exploit details or specific crash conditions.

Mitigation direction

  • Identify applications or products embedding Oracle Outside In Technology 8.5.5.
  • Review Oracle October 2021 Critical Patch Update and vendor advisories for fixed SDK or product builds.
  • Prioritize updates for internet-facing services that pass HTTP data into Outside In filters.
  • If updates are unavailable, restrict network exposure and file-processing paths per vendor guidance.
  • Monitor affected services for repeated crashes or hangs.

Validation and detection

  • Inventory Oracle Outside In Technology libraries and confirm version 8.5.5 presence.
  • Map every application path that sends HTTP-received content to Outside In processing.
  • Check vendor patch levels against Oracle CPU October 2021 guidance.
  • Review availability logs for repeatable crashes, hangs, or restart loops.
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-2021-35656 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-2021-35656Attack 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.