CVE-2026-67865Network attack vector

Remote server crash via undersized notification allocation

Published Aug 5, 2026 · Updated Aug 5, 2026

Out-of-bounds read in Systerel S2OPC 1.7.3 allows remote attackers to crash an OPC UA server through RepublishResponse processing. The response builder preserves a two-element notification count but allocates and copies only one element, causing the encoder to read beyond the heap buffer. Exploitation requires event management, mixed data-change and event notifications, and a remote client that completes the subscription, publish, and republish sequence; the demonstrated consequence is a server crash.

CVSS severity7.5
High
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds read in Systerel S2OPC 1.7.3 allows remote attackers to crash an OPC UA server through RepublishResponse processing. The response builder preserves a two-element notification count but allocates and copies only one element, causing the encoder to read beyond the heap buffer. Exploitation requires event management, mixed data-change and event notifications, and a remote client that completes the subscription, publish, and republish sequence; the demonstrated consequence is a server crash.

The record

CVE
CVE-2026-67865
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-125, T0814, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

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

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T0814Denial of Service
T1499Endpoint Denial of Service

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo