CVE-2026-83347Network attack vector

Service crash via undisclosed TCPS flaw

Published Sep 15, 2026 · Updated Sep 15, 2026

Denial of service in Oracle Net Services in Oracle Database 23.4.0 through 23.26.3 allows remote attackers to crash or hang the service via TCPS. Oracle has not published the affected function or the TCPS input-handling error that causes the listener to fail. Exploitation is unauthenticated over the network but requires interaction by a person other than the attacker, and the bounded impact is repeated service interruption.

CVSS severity6.5
Medium
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Oracle Net Services in Oracle Database 23.4.0 through 23.26.3 allows remote attackers to crash or hang the service via TCPS. Oracle has not published the affected function or the TCPS input-handling error that causes the listener to fail. Exploitation is unauthenticated over the network but requires interaction by a person other than the attacker, and the bounded impact is repeated service interruption.

The record

CVE
CVE-2026-83347
Published
Sep 15, 2026
Updated
Sep 15, 2026
Vendor
Oracle Corporation
Product
Oracle Database
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 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=23.4.0 <=23.26.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Oracle Corporation · Oracle Databaseversion=23.4.0 <=23.26.3

Published CVSS scores

6.5Oracle CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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