CVE-2026-51219Public exploitNetwork attack vector

Server crash via mismatched ASDU queue formats

Published Jun 29, 2026 · Updated Jun 29, 2026

Heap buffer overflow in lib60870 2.3.3 through 2.3.6 allows remote attackers to crash CS104 servers via crafted interactions. HighPriorityASDUQueue_enqueue writes each entry as a 16-bit length followed by ASDU bytes, but HighPriorityASDUQueue_hasUnconfirmedIMessages reads those bytes as a larger metadata structure and advances beyond the queue buffer. An unauthenticated TCP client must reach a CS104 server and drive its high-priority queue through the malformed state; the demonstrated consequence is a server-process crash.

CVSS severity7.5
High
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in lib60870 2.3.3 through 2.3.6 allows remote attackers to crash CS104 servers via crafted interactions. HighPriorityASDUQueue_enqueue writes each entry as a 16-bit length followed by ASDU bytes, but HighPriorityASDUQueue_hasUnconfirmedIMessages reads those bytes as a larger metadata structure and advances beyond the queue buffer. An unauthenticated TCP client must reach a CS104 server and drive its high-priority queue through the malformed state; the demonstrated consequence is a server-process crash.

The record

CVE
CVE-2026-51219
Published
Jun 29, 2026
Updated
Jun 29, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-122, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 29, 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?

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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
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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