CVE-2023-26021Network attack vector

Server crash via crafted LIMIT query compilation

Published Apr 28, 2023 · Updated Feb 13, 2025

Improper input validation in IBM Db2 11.1 and 11.5 allows remote attackers to crash the server with a crafted LIMIT query. The SQL compiler processes the crafted LIMIT clause and terminates the server, but IBM withholds the underlying parser or compiler defect and replication details. No authentication or user interaction is required, and the reported consequence is an availability-only service interruption.

CVSS severity7.5
High
EPSS probability1.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in IBM Db2 11.1 and 11.5 allows remote attackers to crash the server with a crafted LIMIT query. The SQL compiler processes the crafted LIMIT clause and terminates the server, but IBM withholds the underlying parser or compiler defect and replication details. No authentication or user interaction is required, and the reported consequence is an availability-only service interruption.

The record

CVE
CVE-2023-26021
Published
Apr 28, 2023
Updated
Feb 13, 2025
Vendor
IBM
Product
IBM Db2 for Linux, UNIX, and Windows
Classifications
CWE-20, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 28, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record 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=11.1, 11.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · IBM Db2 for Linux, UNIX, and Windowsversion=11.1, 11.5

Published CVSS scores

7.5IBM CorporationCVSS:3.0/AV:N/AC:L/PR:N/UI:N/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

CWE-20Improper Input Validation
T1499Endpoint Denial of Service

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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