Security readout for executives and security teams
Plain-English summary
This issue can let an unauthenticated remote attacker make Oracle Outside In Technology stop responding or crash repeatedly. The business impact is service availability, not data theft or data modification, based on the provided CVSS vector and description.
Executive priority
Treat as a high-priority availability risk for systems that rely on Oracle Outside In to process external content. Prioritize internet-facing or business-critical workflows first because the issue requires no authentication and can cause repeatable outages.
Technical view
CVE-2021-35658 affects Oracle Outside In Technology 8.5.5, component Outside In Filters. It is described as easily exploitable over HTTP with no privileges or user interaction, causing a complete denial of service when integrated software passes network-supplied data into Outside In.
Likely exposure
Exposure is most likely where Oracle Outside In Technology 8.5.5 is embedded in applications that process files or content received over HTTP or other network paths. Actual CVSS may be lower when input is not network-reachable.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The risk comes from unauthenticated, low-complexity remote denial of service against vulnerable deployments, with availability as the only stated impact.
Researcher notes
No CWE is provided in the bundle. The CVSS score assumes network-delivered data reaches Outside In directly; integrated products may alter exposure. The bundle does not provide exploit details, proof of active exploitation, or a standalone workaround beyond Oracle guidance.
Mitigation direction
- Identify deployments using Oracle Outside In Technology 8.5.5 or Outside In Filters.
- Review Oracle October 2021 Critical Patch Update guidance for this CVE.
- Update affected Oracle Outside In components according to vendor guidance.
- Restrict network paths that feed untrusted content into Outside In processing.
- Monitor dependent applications for repeated crashes or processing hangs.
Validation and detection
- Inventory applications that embed Oracle Outside In SDKs or filters.
- Confirm whether version 8.5.5 is present in those applications.
- Trace whether HTTP-received data is passed directly into Outside In.
- Review service logs for recurring crashes, hangs, or restart loops.
- Verify vendor patch status through Oracle CPU documentation.
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-2021-35658 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.