CVE-2026-82619Public exploitNetwork attack vector

Authenticated server crash via filter-result pointer reuse

Published Aug 31, 2026 · Updated Aug 31, 2026

Use after free in Systerel S2OPC 1.7.0 through 1.7.3 allows remote authenticated users to crash an OPC UA server. The ModifyMonitoredItems response loop reuses a prior EventFilterResult pointer when a later same-item entry has an invalid filter, leaving multiple response slots to free the same heap object. An authenticated OPC UA client must submit two modifications for one monitored item; recursive response cleanup then aborts the server process.

CVSS severityUnavailable
Unscored
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use after free in Systerel S2OPC 1.7.0 through 1.7.3 allows remote authenticated users to crash an OPC UA server. The ModifyMonitoredItems response loop reuses a prior EventFilterResult pointer when a later same-item entry has an invalid filter, leaving multiple response slots to free the same heap object. An authenticated OPC UA client must submit two modifications for one monitored item; recursive response cleanup then aborts the server process.

The record

CVE
CVE-2026-82619
Published
Aug 31, 2026
Updated
Aug 31, 2026
Vendor
Systerel
Product
S2OPC
Classifications
CWE-416, CWE-119, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 31, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.7.0
  2. Affected versionversion=1.7.1
  3. Affected versionversion=1.7.2
  4. Affected versionversion=1.7.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Systerel · S2OPCversion=1.7.0; version=1.7.1; version=1.7.2; version=1.7.3

Published CVSS scores

4.0VulDB CNAAV:N/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:OF/RC:C
4.3VulDB CNACVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
4.3VulDB CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
5.3VulDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

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 exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
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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