CVE-2026-75347Public exploitNetwork attack vectorHinoki check available

Service crash via stale CPF pointer reuse

Published Oct 9, 2026 · Updated Oct 9, 2026

Expired-pointer dereference in EIPStackGroup OpENer 2.3 CPF handling allows remote attackers to crash the service via TCP and UDP packets. CreateCommonPacketFormatStructure leaves the global data_item unchanged when a TCP SendUnitData packet contains only an address item, so connected handling dereferences a pointer retained from a returned UDP stack frame. The trigger requires normal I/O and class3 connections without credentials; the demonstrated outcome is an AddressSanitizer process crash, not code execution.

CVSS severity7.5
High
EPSS probability0.42%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Expired-pointer dereference in EIPStackGroup OpENer 2.3 CPF handling allows remote attackers to crash the service via TCP and UDP packets. CreateCommonPacketFormatStructure leaves the global data_item unchanged when a TCP SendUnitData packet contains only an address item, so connected handling dereferences a pointer retained from a returned UDP stack frame. The trigger requires normal I/O and class3 connections without credentials; the demonstrated outcome is an AddressSanitizer process crash, not code execution.

The record

CVE
CVE-2026-75347
Published
Oct 9, 2026
Updated
Oct 9, 2026
Vendor
EIPStackGroup
Product
OpENer
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 9, 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?

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  1. Affected versionversion=n/a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

EIPStackGroup · OpENerversion=n/a

Published CVSS scores

7.5MITRECVSS:3.1/AC:L/AV:N/A:H/C:N/I:N/PR:N/S:U/UI:N

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

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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