CVE-2026-71063

Unauthenticated takeover from adjacent network segments

Published Aug 18, 2026 · Updated Aug 19, 2026

Improper access control in affected Oracle Database Server releases allows remote attackers to take over Portable Clusterware via TLS. Oracle has not published the faulty access-control operation or the TLS message sequence that reaches it. Exploitation requires no credentials or user interaction, but the attacker must access the physical communication segment attached to the cluster hardware; takeover can affect confidentiality, integrity, and availability beyond Portable Clusterware.

CVSS severity9.6
Critical
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in affected Oracle Database Server releases allows remote attackers to take over Portable Clusterware via TLS. Oracle has not published the faulty access-control operation or the TLS message sequence that reaches it. Exploitation requires no credentials or user interaction, but the attacker must access the physical communication segment attached to the cluster hardware; takeover can affect confidentiality, integrity, and availability beyond Portable Clusterware.

The record

CVE
CVE-2026-71063
Published
Aug 18, 2026
Updated
Aug 19, 2026
Vendor
Oracle Corporation
Product
Oracle Database
Classifications
CWE-284, T1210
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 2026Record 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=19.3 <=19.32
  2. Affected versionversion=21.3 <=21.23
  3. Affected versionversion=23.4.0 <=23.26.3

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Oracle Corporation · Oracle Databaseversion=19.3 <=19.32; version=21.3 <=21.23; version=23.4.0 <=23.26.3

Published CVSS scores

9.6Oracle CorporationCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1210Exploitation of Remote Services

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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