Security readout for executives and security teams
Plain-English summary
This flaw can let an unauthenticated remote user crash software that uses Oracle Outside In Technology 8.5.5. The business impact is availability: affected services may hang or repeatedly crash if they process attacker-supplied content over HTTP.
Executive priority
Treat as high priority for internet-facing or business-critical document processing services. The main risk is outage, so remediation urgency depends on exposure and service criticality.
Technical view
CVE-2021-35661 affects Oracle Outside In Technology 8.5.5, component Outside In Filters. Oracle describes it as easily exploitable over HTTP with no privileges or user interaction, causing complete denial of service. The CVSS 7.5 score assumes network data is passed directly to the SDK.
Likely exposure
Exposure is most likely where applications embed Oracle Outside In Technology 8.5.5 and process untrusted HTTP-submitted files or data. The sources do not enumerate downstream products or deployments.
Exploitation context
The provided sources do not report active exploitation, and the CVE is not marked KEV. The described attack outcome is denial of service, not data theft or code execution.
Researcher notes
Oracle notes the CVSS score depends on the embedding software and data path. If data is not received over a network, the effective score may be lower. Evidence is incomplete for exploit activity and downstream affected products.
Mitigation direction
- Review Oracle's October 2021 CPU for the applicable Outside In Technology update.
- Identify applications embedding Oracle Outside In Technology 8.5.5.
- Prioritize remediation where HTTP input reaches Outside In processing.
- Check downstream product vendors for bundled Outside In fixes.
- Limit exposure of affected processing endpoints until vendor guidance is applied.
Validation and detection
- Inventory deployed Outside In Technology versions and confirm whether 8.5.5 is present.
- Map whether network-submitted data is passed to Outside In filters.
- Check Oracle CPU applicability for each affected deployment.
- Review service monitoring for unexplained hangs or repeat crashes.
- Confirm patched or vendor-fixed builds after remediation.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-35661 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- 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
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.
CVSS vector scores
1 official scoreWe 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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.oracle.com/security-alerts/cpuoct2021.htmlCVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.