CVE-2025-33131Network attack vector

Authenticated crash via stack buffer overwrite

Published Oct 27, 2025 · Updated Oct 27, 2025

Stack buffer overflow in IBM Db2 High Performance Unload for z/OS allows remote authenticated users to crash the utility. The affected code writes past a stack-allocated buffer, but IBM has not disclosed the input field, function, or request path that reaches the copy. Low-privileged authentication is required, and the documented consequence is a crash with no confidentiality or integrity impact.

CVSS severity6.5
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in IBM Db2 High Performance Unload for z/OS allows remote authenticated users to crash the utility. The affected code writes past a stack-allocated buffer, but IBM has not disclosed the input field, function, or request path that reaches the copy. Low-privileged authentication is required, and the documented consequence is a crash with no confidentiality or integrity impact.

The record

CVE
CVE-2025-33131
Published
Oct 27, 2025
Updated
Oct 27, 2025
Vendor
IBM
Product
IBM Db2 High Performance Unload for z/OS
Classifications
CWE-120, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 27, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 27, 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=5.1
  2. Affected versionversion=5.1.0.1
  3. Affected versionversion=6.1
  4. Affected versionversion=6.1.0.1
  5. Affected versionversion=6.1.0.2
  6. Affected versionversion=6.1.0.3
  7. Affected versionversion=6.5
  8. Affected versionversion=6.5.0.0 IF1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

IBM · IBM Db2 High Performance Unload for z/OSversion=5.1; version=5.1.0.1; version=6.1; version=6.1.0.1; version=6.1.0.2; version=6.1.0.3; version=6.5; version=6.5.0.0 IF1

Published CVSS scores

6.5IBMCVSS:3.1/AV:N/AC:L/PR:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
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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