CVE-2021-29703Network attack vector

Unauthenticated server crash via invalid-view SELECT

Published Jun 24, 2021 · Updated Sep 16, 2024

Denial of service in IBM Db2 9.7, 10.1, 10.5, 11.1, and 11.5 allows remote attackers to crash the server via a crafted SELECT statement. Db2 processing of a SELECT from an invalid view terminates the server instead of rejecting the query. No authentication or user interaction is required, and successful exploitation interrupts database availability until recovery.

CVSS severity7.5
High
EPSS probability1.69%
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 IBM Db2 9.7, 10.1, 10.5, 11.1, and 11.5 allows remote attackers to crash the server via a crafted SELECT statement. Db2 processing of a SELECT from an invalid view terminates the server instead of rejecting the query. No authentication or user interaction is required, and successful exploitation interrupts database availability until recovery.

The record

CVE
CVE-2021-29703
Published
Jun 24, 2021
Updated
Sep 16, 2024
Vendor
IBM
Product
IBM Db2 for Linux, UNIX, and Windows
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 24, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record 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=10.1
  2. Affected versionversion=10.5
  3. Affected versionversion=11.1
  4. Affected versionversion=11.5
  5. Affected versionversion=9.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · IBM Db2 for Linux, UNIX, and Windowsversion=10.1; version=10.5; version=11.1; version=11.5; version=9.7

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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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