CVE-2026-47040Network attack vector

Unauthenticated data disclosure and service crashes

Published Jul 21, 2026 · Updated Jul 21, 2026

Authentication bypass in Oracle Net Services 19.3 through 19.31, 21.3 through 21.22, and 23.4.0 through 23.26.2 allows remote attackers to read data. Oracle identifies the affected locus as Connection Manager but has not published the request-processing error that permits unauthenticated access. Network access over Oracle Net requires no credentials or user interaction and exposes critical data while allowing a hang or repeatable service crash.

CVSS severity9.1
Critical
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Oracle Net Services 19.3 through 19.31, 21.3 through 21.22, and 23.4.0 through 23.26.2 allows remote attackers to read data. Oracle identifies the affected locus as Connection Manager but has not published the request-processing error that permits unauthenticated access. Network access over Oracle Net requires no credentials or user interaction and exposes critical data while allowing a hang or repeatable service crash.

The record

CVE
CVE-2026-47040
Published
Jul 21, 2026
Updated
Jul 21, 2026
Vendor
Oracle
Product
Oracle Net Services
Classifications
CWE-306, T1210, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 21, 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 <=19.31
  2. Affected versionversion=21.3 <=21.22
  3. Affected versionversion=23.4.0 <=23.26.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Oracle · Oracle Net Servicesversion=19.3 <=19.31; version=21.3 <=21.22; version=23.4.0 <=23.26.2

Published CVSS scores

9.1OracleCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1210Exploitation of Remote Services
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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