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IBM DataPower Gateway EUVDEUVD-2026-94890

| CVE-2026-16177 MEDIUM
Out-of-bounds Read (CWE-125)
2026-10-08 psirt@us.ibm.com GHSA-4qc5-wccj-3v7v
5.3
CVSS 3.1 · Vendor: us
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Authenticate to DataPower Gateway
  2. Exploit
    Send crafted malformed request
  3. Execution
    Trigger out-of-bounds read in parser
  4. Impact
    Receive leaked adjacent memory

Vulnerability Assessment

Weakness
CWE
ASVS 5.0
V15 - Secure Coding and Architecture Bounds checking, read limits
MITRE ATT&CK

1 technique across 1 tactic: Collection

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Exploitation Conditions

Per IBM's description, the attacker must be a REMOTE AUTHENTICATED user of the DataPower Gateway - i.e., possess valid credentials to reach the vulnerable request-handling interface - on versions 10.5.0.0-10.5.0.22, 10.6.1-10.6.6, 10.6.0.0-10.6.0.10, or 11.0.0.0-11.0.0.2. No specific feature toggle or non-default configuration is named in the description. The primary limiting factor is the authentication requirement stated by IBM (which directly contradicts the NVD vector's PR:N); combined with only low confidentiality impact and no integrity/availability effect, realistic risk is constrained to credentialed actors harvesting memory fragments rather than unauthenticated mass exploitation.

Impact

This is a moderate-severity information disclosure flaw (CWE-125 out-of-bounds read) with a CVSS base score of 5.3. The signals are largely consistent on impact but CONFLICT on privileges: the NVD CVSS vector (AV:N/AC:L/PR:N/UI:N) encodes an unauthenticated network attacker, yet the IBM-authored description explicitly states a 'remote authenticated attacker' - these cannot both be true, and the discrepancy materially changes exposure (internet-facing unauth vs. requiring a valid gateway credential). This should be verified against the IBM advisory (node/7289775); the description, coming from IBM PSIRT itself, is the more authoritative source and suggests PR:N in the NVD vector is likely an error. No EPSS score, KEV listing, or POC was provided, so exploitation probability cannot be quantified from the input; per available data this is 'no public exploit identified at time of analysis.' Impact is limited (C:L, I:N, A:N) - only partial confidentiality loss (adjacent memory such as process data, not guaranteed secrets), no integrity or availability effect. Net: a real but low-priority issue absent evidence of exploitation - patch in normal cycles unless the unauthenticated-vs-authenticated question resolves toward unauthenticated internet-facing exposure.

Exploit ScenarioDerived

An attacker with access to the DataPower Gateway management or data plane (authentication required per IBM's description) sends a crafted request that causes the gateway to read beyond an allocated buffer, returning adjacent process memory in the response. Over repeated requests this could leak fragments of sensitive runtime data. No public exploit code was identified in the provided intelligence.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
No patch listed yet 0.3% exploitation probability (EPSS)

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AnalysisAIv1 – Oct 08, 2026

An out-of-bounds read in IBM DataPower Gateway (CWE-125) lets an attacker who already holds valid credentials on the gateway reach past intended buffer boundaries and have fragments of process memory returned to them, disclosing limited sensitive information. Affected release trains are 10.5.0.0 through 10.5.0.22, 10.6.0.0 through 10.6.0.10, 10.6.1 through 10.6.6, and 11.0.0.0 through 11.0.0.2, as listed in ENISA EUVD-2026-94890 and IBM's advisory node/7289775. The base score is 5.3 with confidentiality-only, low-severity impact and no effect on integrity or availability; IBM's description requires a remote authenticated user, which the independent assessment reflects by treating the vector as PR:L instead of NVD's PR:N. No public exploit code has been identified at time of analysis and there is no CISA KEV entry, so realistic risk is confined to credentialed actors and compromised accounts rather than unauthenticated mass exploitation.

RemediationAI

No vendor-released patch is identified in the provided data, so the first step is to retrieve the fixed firmware level for each affected train directly from IBM's advisory at https://www.ibm.com/support/pages/node/7289775 and schedule an upgrade; because the flaw spans three release trains (10.5.0.x, 10.6.0.x/10.6.1.x CD, and 11.0.0.x), confirm the fix level per train rather than assuming a single upgrade path, and be aware that DataPower firmware upgrades require a maintenance window and configuration backup. Until the upgrade is applied, the most effective compensating control follows directly from the prerequisite that the attacker must already be authenticated: enforce least privilege on all DataPower administrative and application accounts, remove or disable dormant and shared accounts, rotate credentials for accounts that can reach the request-handling interface, and restrict which networks and users may connect to that interface using network ACLs or the appliance's own access controls - the trade-off being that legitimate operator and API-consumer access must be re-scoped and may require new firewall rules. Where the vulnerable handler is exposed only by specific service objects or front-side handlers, disabling those unused handlers reduces the attack surface at the cost of losing the corresponding protocol or API functionality. Finally, because exploitation is repetitive memory harvesting, watch logs and response-size metrics for anomalous error patterns or unusually large responses from a single authenticated principal, and treat any suspected successful read as a credential-compromise event requiring rotation of secrets that may have been resident in the leaked memory.

Affected VersionsENISA

DataPower Gateway 10.5.0 10.5.0.0 ≤10.5.0.22
DataPower Gateway 10.6CD 10.6.1 ≤10.6.6
DataPower Gateway 10.6.0 10.6.0.0 ≤10.6.0.10
DataPower Gateway 11.0.0 11.0.0.0 ≤11.0.0.2

Affected Packages

euvd datapower_gateway_10_5_0 no fix
euvd datapower_gateway_10_6_0 no fix
euvd datapower_gateway_10_6cd no fix
euvd datapower_gateway_11_0_0 no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 4 packages in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

IBM DataPower Gateway is a multi-protocol security and integration appliance that terminates and transforms XML, JSON, SOAP, MQ, and API traffic, with a substantial C/C++ code base handling parser and protocol logic. CWE-125 (out-of-bounds read) is a memory-safety class in which a length field, index, or pointer offset supplied through a request is used without being validated against the actual size of the backing buffer, so the code reads bytes adjacent to the intended object - typically heap or stack memory - and can surface them in a response, log, or error message. Because the defect is a read and not a write, the classic exploitation path of corrupting a control structure toward remote code execution does not apply; the primary consequence is information leakage, which is consistent with the CVSS 5.3 profile of low confidentiality impact and no integrity or availability impact. The 'Buffer Overflow' tag should be read in that context - an out-of-bounds access that is disclosure-only rather than a write-based overflow. The affected ranges span three parallel release trains, strongly suggesting a shared parsing/handling component present across 10.5.0.x, 10.6.0.x/10.6.1.x (the 10.6 CD train), and 11.0.0.x, and the need for credentials indicates the vulnerable handler sits behind the gateway's authenticated request interface rather than on an unauthenticated pre-auth path. Exploitation is opportunistic memory harvesting: an attacker with a valid account repeatedly probes the interface and collects whatever adjacent memory is reflected back, potentially capturing tokens, configuration fragments, or other tenants' data depending on memory layout.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (us) PRIMARY 5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
vuln.today AI 4.3 MEDIUM

IBM's description states authentication is required, so PR:L (not NVD's PR:N); network-reachable with low complexity, and only limited confidentiality loss (C:L, I:N, A:N) for an out-of-bounds read.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (us).

CVSS VectorVendor: us

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

DescriptionCVE.org

IBM DataPower Gateway 10.5.0.0 through 10.5.0.22, 10.6.1 through 10.6.6, 10.6.0.0 through 10.6.0.10, 11.0.0.0 through 11.0.0.2 could allow a remote authenticated attacker to obtain sensitive information due to an out-of-bounds read.

Threat Intelligence Overview

EPSS Score
0.3%
Top 78% exploitable
Prevalence
Medium
enterprise API gateway/security appliance, common but not universal
Data Quality
5 sources
Confidence: Medium

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.3%
Patch available No
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation
None
System Exposure· derived
Open
Automatable
Yes
Human Impact· derived
Medium
Technical Impact
Partial

Priority Score

26
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +26
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

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CVE-2019-4621 CRITICAL
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IBM DataPower Gateway 7.6.0.0-7 throug 6.0.14 and 2018.4.1.0 through 2018.4.1.5 have a default administrator account tha

CVE-2022-31775 CRITICAL
9.1 Aug 01

IBM DataPower Gateway 10.0.2.0 through 10.0.4.0, 10.0.1.0 through 10.0.1.8, 10.5.0.0, and 2018.4.1.0 through 2018.4.1.21

CVE-2022-31773 HIGH
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IBM DataPower Gateway V10CD, 10.0.1, and 2018.4.1 is vulnerable to cross-site request forgery which could allow an attac

CVE-2022-31776 HIGH
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CVE-2018-1661 HIGH
8.8 Dec 20

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CVE-2019-4294 HIGH
7.8 Aug 20

IBM DataPower Gateway 2018.4.1.0 through 2018.4.1.6, 7.6.0.0 through 7.6.0.15 and IBM MQ Appliance 8.0.0.0 through 8.0.0

CVE-2018-1664 HIGH
7.8 Sep 25

IBM DataPower Gateway 7.1.0.0 - 7.1.0.23, 7.2.0.0 - 7.2.0.21, 7.5.0.0 - 7.5.0.16, 7.5.1.0 - 7.5.1.15, 7.5.2.0 - 7.5.2.15

CVE-2026-16170 HIGH
7.5 Oct 08

A heap buffer overflow in IBM DataPower Gateway (affected firmware levels 10.5.0.0 through 10.5.0.22, 10.6.0.0 through 1

CVE-2026-16178 HIGH
7.5 Oct 08

Denial of service in IBM DataPower Gateway allows a remote, unauthenticated attacker to crash or degrade an affected gat

CVE-2026-16176 HIGH
7.5 Oct 08

Denial of service in IBM DataPower Gateway allows a remote, unauthenticated attacker to crash or exhaust the message-pro

CVE-2026-16169 HIGH
7.5 Oct 08

Unauthenticated remote attackers can exhaust system resources on IBM DataPower Gateway firmware releases 11.0.0.0 throug

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