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CVE-2023-50308VulnerabilityPublished Updated

CVE-2023-50308: IBM Db2 for Linux, UNIX and Windows · Improper Input Validation

Affects IBM Db2 for Linux, UNIX and WindowsSource CVE Database V5

0

Not known to be exploited · CVSS 6.5 Medium.

Data as of 26 Oct 2026, 07:57 UTC

CVSS 3.1 base score
6.5Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.7% chance of exploitation in 30 days – higher than 55% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 22 Jan 2024

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-26.

What to do

Affected software

ProductAffectedFixed in
IBM Db2 for Linux, UNIX and WindowsAffected
  • =11.5
Fixed in–

AI-suggested

1. Immediate mitigation involves restricting database access to trusted and authenticated users only, enforcing strong authentication mechanisms, and monitoring for unusual query patterns targeting columnar tables. 2. Implement strict role-based access controls (RBAC) to limit privileges to only necessary users, minimizing the risk of misuse by authenticated users. 3. Monitor database logs and alerts for signs of abnormal statement executions or repeated failures that could indicate exploitation attempts. 4. Engage with IBM support to obtain official patches or workarounds as soon as they become available; prioritize patching affected Db2 11.5 instances. 5. Consider deploying database activity monitoring (DAM) tools that can detect and block anomalous queries in real-time. 6. Conduct regular security audits and vulnerability assessments focused on database configurations and user privileges. 7. For critical environments, implement failover and redundancy mechanisms to reduce downtime impact in case of a DoS event. 8. Educate database administrators and security teams about this vulnerability to ensure rapid detection and response.

Description

IBM Db2 for Linux, UNIX and Windows (includes DB2 Connect Server) 11.5 under certain circumstances could allow an authenticated user to the database to cause a denial of service when a statement is run on columnar tables. IBM X-Force ID: 273393.

References

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