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CVE Record

CVE-2021-35558: Vulnerability in the Core RDBMS component of Oracle Database Server.

Vulnerability in the Core RDBMS component of Oracle Database Server. Supported versions that are affected are 12.1.0.2, 12.2.0.1, 19c and 21c. Easily exploitable vulnerability allows low privileged attacker having Create Table privilege with network access via Oracle Net to compromise Core RDBMS. Successful attacks of this vulnerability can result in unauthorized ability to cause a partial denial of service (partial DOS) of Core RDBMS. CVSS 3.1 Base Score 4.3 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L).

MediumCVSS 4.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This Oracle Database issue can let a low-privileged database user disrupt part of the Core RDBMS service. It does not expose confidentiality or integrity impact in the supplied CVSS data, but availability degradation in production databases can still affect business operations.

Executive priority

Prioritize through normal database patch governance unless the affected database supports critical operations or broad low-privileged access exists. Availability impact is limited to partial denial of service, but database downtime can create business disruption.

Technical view

CVE-2021-35558 affects Oracle Database Server Core RDBMS in Enterprise Edition 12.1.0.2, 12.2.0.1, 19c, and 21c. An attacker with network access via Oracle Net and Create Table privilege can trigger partial denial of service. CVSS 3.1 score is 4.3, with low attack complexity and low privileges required.

Likely exposure

Exposure is most likely in Oracle Database environments on affected versions where low-privileged accounts retain Create Table privilege and can connect through Oracle Net.

Exploitation context

The supplied sources describe the vulnerability as easily exploitable, but they do not show active exploitation, public exploit availability, or CISA KEV inclusion.

Researcher notes

No CWE is provided in the bundle. The key conditions are Oracle Net reachability, low privileges, and Create Table permission. The stated impact is availability only, with no confidentiality or integrity impact in CVSS.

Mitigation direction

  • Review Oracle's October 2021 Critical Patch Update for applicable fixes.
  • Patch or upgrade affected Oracle Database versions per Oracle guidance.
  • Restrict Oracle Net access to trusted networks and application tiers.
  • Review and minimize Create Table privileges for low-privileged accounts.
  • Monitor Core RDBMS availability errors and unusual session activity.

Validation and detection

  • Inventory Oracle Database versions across production and non-production systems.
  • Confirm whether 12.1.0.2, 12.2.0.1, 19c, or 21c are present.
  • Check patch levels against Oracle's October 2021 CPU guidance.
  • Identify accounts with Create Table privilege and network access.
  • Verify Oracle Net exposure from user, application, and partner networks.
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

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

description · low confidence lookup

Database behavior lookup

The CVE wording references database injection or access, so collection and exfiltration review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2021-35558 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
Medium
CVSS
4.3 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

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
4.3CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L2.81.4Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

4.3Medium
CVSS 3.1 vector shape for CVE-2021-35558Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

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 CorporationDatabase - Enterprise Edition12.1.0.2, 12.2.0.1, 19c, 21cListed
Weakness

CWE details

No CWE listed

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