CVE-2021-29763

Service interruption via repeated procedure memory exhaustion

Published Sep 16, 2021 · Updated Sep 16, 2024

Denial of service in IBM Db2 11.1 and 11.5 allows local users to exhaust system memory by repeatedly running a procedure. IBM has not identified the procedure or disclosed why its repeated execution leaves memory allocated until system memory is exhausted. Exploitation requires local execution under high-complexity, undisclosed conditions and interrupts availability without reading or modifying data.

CVSS severity5.1
Medium
EPSS probability0.25%
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 11.1 and 11.5 allows local users to exhaust system memory by repeatedly running a procedure. IBM has not identified the procedure or disclosed why its repeated execution leaves memory allocated until system memory is exhausted. Exploitation requires local execution under high-complexity, undisclosed conditions and interrupts availability without reading or modifying data.

The record

CVE
CVE-2021-29763
Published
Sep 16, 2021
Updated
Sep 16, 2024
Vendor
IBM
Product
IBM Db2 for Linux, UNIX, and Windows
Classifications
CWE-770, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 16, 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=11.1
  2. Affected versionversion=11.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

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

Published CVSS scores

5.1IBMCVSS:3.0/AV:L/AC:H/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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