CVE-2026-17270Network attack vector

Service interruption via Debug Server stack overflow

Published Sep 4, 2026 · Updated Sep 4, 2026

Stack-based buffer overflow in IBM's Debug Server on releases 7.3 through 7.6 allows local users to interrupt service. The vendor has not disclosed which Debug Server routine mishandles input, what data reaches the stack buffer, or the operation that exceeds the buffer bounds. The CVSS vector treats the path as network-reachable with low privileges, while the description characterizes the attacker as local; the reported impact is limited to availability.

CVSS severity4.3
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in IBM's Debug Server on releases 7.3 through 7.6 allows local users to interrupt service. The vendor has not disclosed which Debug Server routine mishandles input, what data reaches the stack buffer, or the operation that exceeds the buffer bounds. The CVSS vector treats the path as network-reachable with low privileges, while the description characterizes the attacker as local; the reported impact is limited to availability.

The record

CVE
CVE-2026-17270
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
IBM
Product
IBM i
Classifications
CWE-121, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 2026Record 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=7.3
  2. Affected versionversion=7.4
  3. Affected versionversion=7.5
  4. Affected versionversion=7.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

IBM · IBM iversion=7.3; version=7.4; version=7.5; version=7.6

Published CVSS scores

4.3IBMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based 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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