CVE-2026-83349: Easily exploitable vulnerability allows unauthenticated attacker with network access via Oracle Net to compromise Oracle Net Services. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Net Services. in Oracle Corporation Oracle Database Server
Vulnerability in the Oracle Net Services component of Oracle Database Server. Supported versions that are affected are 19.3-19.32, 21.3-21.23 and 23.4.0-23.26.3. Easily exploitable vulnerability allows unauthenticated attacker with network access via Oracle Net to compromise Oracle Net Services. 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 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
AI Analysis
Technical Summary
This vulnerability in Oracle Net Services enables an unauthenticated attacker with network access to cause a denial of service by hanging or crashing the service. The affected versions include Oracle Database Server 19.3 through 19.32, 21.3 through 21.23, and 23.4.0 through 23.26.3. The CVSS 3.1 base score is 7.5, reflecting a high impact on availability without confidentiality or integrity impact. Oracle has included a fix for this vulnerability in its September 2026 Critical Security Patch Update, which contains 673 security patches across multiple products.
Potential Impact
Successful exploitation results in unauthorized ability to cause a hang or frequent crash of Oracle Net Services, leading to a complete denial of service. There is no impact on confidentiality or integrity reported. The vulnerability is easily exploitable by unauthenticated attackers with network access.
Mitigation Recommendations
Oracle has released a Critical Security Patch Update in September 2026 that addresses this vulnerability. Customers are strongly advised to apply the relevant patches promptly to mitigate the risk. Oracle emphasizes remaining on actively supported versions and applying security patches without delay. No additional mitigation steps are specified beyond patching.
CVE-2026-83349: Easily exploitable vulnerability allows unauthenticated attacker with network access via Oracle Net to compromise Oracle Net Services. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Net Services. in Oracle Corporation Oracle Database Server
Description
Vulnerability in the Oracle Net Services component of Oracle Database Server. Supported versions that are affected are 19.3-19.32, 21.3-21.23 and 23.4.0-23.26.3. Easily exploitable vulnerability allows unauthenticated attacker with network access via Oracle Net to compromise Oracle Net Services. 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 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
CVSS v3.1
Score 7.5high
Affected software
Oracle Corporation
Oracle Database Server
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Oracle Net Services enables an unauthenticated attacker with network access to cause a denial of service by hanging or crashing the service. The affected versions include Oracle Database Server 19.3 through 19.32, 21.3 through 21.23, and 23.4.0 through 23.26.3. The CVSS 3.1 base score is 7.5, reflecting a high impact on availability without confidentiality or integrity impact. Oracle has included a fix for this vulnerability in its September 2026 Critical Security Patch Update, which contains 673 security patches across multiple products.
Potential Impact
Successful exploitation results in unauthorized ability to cause a hang or frequent crash of Oracle Net Services, leading to a complete denial of service. There is no impact on confidentiality or integrity reported. The vulnerability is easily exploitable by unauthenticated attackers with network access.
Mitigation Recommendations
Oracle has released a Critical Security Patch Update in September 2026 that addresses this vulnerability. Customers are strongly advised to apply the relevant patches promptly to mitigate the risk. Oracle emphasizes remaining on actively supported versions and applying security patches without delay. No additional mitigation steps are specified beyond patching.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- oracle
- Date Reserved
- 2026-08-31T15:40:57.354Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://www.oracle.com/security-alerts/cspusep2026.html","vendor":"Oracle"}]
Threat ID: 6aa9a84455bf5e2cf553819b
Added to database: 09/15/2026, 20:19:16 UTC
Last enriched: 09/15/2026, 23:05:15 UTC
Last updated: 09/16/2026, 04:01:23 UTC
Views: 4
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.