CVE-2023-28955Network attack vector

Authenticated service interruption via malformed request

Published Jul 10, 2023 · Updated Oct 25, 2024

Improper input validation in IBM Watson Knowledge Catalog on Cloud Pak for Data 4.x allows remote authenticated users to interrupt service. The service accepts a specially crafted request without adequate validation, but IBM has not disclosed the affected handler, malformed field, or failure mode. Valid application credentials and network access are required, and the documented consequence is limited to service interruption.

CVSS severity6.5
Medium
EPSS probability0.98%
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 Watson Knowledge Catalog on Cloud Pak for Data 4.x allows remote authenticated users to interrupt service. The service accepts a specially crafted request without adequate validation, but IBM has not disclosed the affected handler, malformed field, or failure mode. Valid application credentials and network access are required, and the documented consequence is limited to service interruption.

The record

CVE
CVE-2023-28955
Published
Jul 10, 2023
Updated
Oct 25, 2024
Vendor
IBM
Product
IBM Knowledge Catalog
Classifications
CWE-20, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 25, 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=4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

IBM · IBM Knowledge Catalogversion=4.0

Published CVSS scores

6.5IBM CorporationCVSS:3.0/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.

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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-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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