CVE-2021-35551Network attack vector

DBA-triggered data modification and service interruption

Published Oct 20, 2021 · Updated Sep 25, 2024

A flaw in Oracle Database 12.2.0.1, 19c, and 21c allows remote authenticated users with DBA privileges to alter data or halt service. Oracle identifies the affected locus only as the RDBMS Security component and has not disclosed the faulty operation or triggering input. Exploitation requires Oracle Net access and DBA privileges; successful attacks can update, insert, or delete some accessible data and hang or repeatedly crash the component.

CVSS severity5.5
Medium
EPSS probability0.79%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A flaw in Oracle Database 12.2.0.1, 19c, and 21c allows remote authenticated users with DBA privileges to alter data or halt service. Oracle identifies the affected locus only as the RDBMS Security component and has not disclosed the faulty operation or triggering input. Exploitation requires Oracle Net access and DBA privileges; successful attacks can update, insert, or delete some accessible data and hang or repeatedly crash the component.

The record

CVE
CVE-2021-35551
Published
Oct 20, 2021
Updated
Sep 25, 2024
Vendor
Oracle Corporation
Product
Oracle Database
Classifications
T1565.001, T1499.004
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Oct 20, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=12.2.0.1
  2. Affected versionversion=19c
  3. Affected versionversion=21c

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Oracle Corporation · Oracle Databaseversion=12.2.0.1; version=19c; version=21c

Published CVSS scores

5.5NIST NVDAV:N/AC:L/Au:S/C:N/I:P/A:P
5.5OracleCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1565.001Stored Data Manipulation
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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