CVE-2026-75352Public exploitNetwork attack vectorHinoki check available

Service interruption via incorrect connection-path word accounting

Published Oct 9, 2026 · Updated Oct 9, 2026

Integer underflow in EIPStackGroup OpENer 2.3 allows remote attackers to interrupt service via crafted ForwardOpen requests. ParseConnectionPath() subtracts two words for a one-word Production Inhibit Time segment, underflowing remaining_path and making GetPathSegmentType() read beyond the request buffer. Exploitation requires an unauthenticated TCP/44818 session and a non-cyclic connection request; sanitizer builds crash, while non-sanitized behavior depends on runtime conditions.

CVSS severityUnavailable
Unscored
EPSS probability0.33%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Integer underflow in EIPStackGroup OpENer 2.3 allows remote attackers to interrupt service via crafted ForwardOpen requests. ParseConnectionPath() subtracts two words for a one-word Production Inhibit Time segment, underflowing remaining_path and making GetPathSegmentType() read beyond the request buffer. Exploitation requires an unauthenticated TCP/44818 session and a non-cyclic connection request; sanitizer builds crash, while non-sanitized behavior depends on runtime conditions.

The record

CVE
CVE-2026-75352
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

No CVSS assessment is available in this record.

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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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