CVE-2026-18343

Analyzed Analyzed - Analysis Complete

Unauthorized BOOTP Table Modification in IBM i

Publication date: 2026-10-13

Last updated on: 2026-10-14

Assigner: IBM Corporation

Description

IBM i 7.3, 7.4, 7.5, and 7.6 could allow a local attacker to modify the BOOTP table due to improper authorization.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-13

Last Modified

2026-10-14

Generated

2026-10-19

AI Q&A

2026-10-13

EPSS Evaluated

2026-10-18

NVD

CVE-2026-18343

EUVD

EUVD-2026-98179

Affected Vendors & Products

Vendor	Product	Version / Range
ibm	i	From 7.3 (inc) to 7.6 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-269	The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.

Attack-Flow Graph

Executive Summary

IBM i 7.3, 7.4, 7.5, and 7.6 are vulnerable to a local attacker modifying the BOOTP table due to improper authorization. This flaw allows unauthorized changes to network boot configurations, potentially disrupting system operations.

Detection Guidance

Detection requires checking for unauthorized modifications to the BOOTP table on IBM i systems. Review system logs for unexpected changes to network configuration files or BOOTP entries. Compare current BOOTP table entries with known good configurations. Verify PTF levels to ensure fixes are applied.

Impact Analysis

A local attacker could exploit this to alter network boot settings, leading to unauthorized system access, service disruptions, or misconfigured network environments. The impact is limited to local access with low privileges.

Compliance Impact

This vulnerability may violate compliance requirements that mandate strict access controls and system integrity, such as GDPR (data protection) or HIPAA (health data security). Unauthorized modifications could lead to non-compliance penalties.

Mitigation Strategies

Apply the provided PTF fixes for your IBM i version: SJ11463 for 7.3, SJ11462 for 7.4, SJ11461 for 7.5, or SJ11460 for 7.6. Alternatively, upgrade to a supported version if possible.

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