Medium severity · published Sep 15, 2026
CVE-2026-83347
Vulnerability in the Oracle Net Services component of Oracle Database Server
6.5
CVSS
0.4%
EPSS
No
On KEV
Description
Vulnerability in the Oracle Net Services component of Oracle Database Server. Supported versions that are affected are 23.4.0-23.26.3. Easily exploitable vulnerability allows unauthenticated attacker with network access via TCPS to compromise Oracle Net Services. Successful attacks require human interaction from a person other than the attacker. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Net Services. CVSS 3.1 Base Score 6.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H).
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OD
Oracle Database Server · Oracle Corporation
23.4.0 through 23.26.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-83347
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-83347
www.oracle.com
https://www.oracle.com/security-alerts/cspusep2026.html
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