A heap buffer overflow in the TS7Worker::PerformFunctionWrite() function (/core/s7_server.cpp) of snap7 v1.4.3 allows attackers to cause a Denial of Service (DoS) via a crafted packet.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation poc

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Davenardella
  • Snap7

No data.

No data.

References
Link Providers
https://github.com/davenardella/snap7 cve-icon
https://github.com/davenardella/snap7/issues/14 cve-icon cve-icon
History

Wed, 01 Jul 2026 10:30:00 +0000

Type Values Removed Values Added
First Time appeared Davenardella
Davenardella snap7
Vendors & Products Davenardella
Davenardella snap7

Tue, 30 Jun 2026 16:45:00 +0000

Type Values Removed Values Added
Title Heap Buffer Overflow in snap7 TS7Worker Function Causes Denial of Service

Tue, 30 Jun 2026 14:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-122
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Mon, 29 Jun 2026 22:30:00 +0000

Type Values Removed Values Added
Description A heap buffer overflow in the TS7Worker::PerformFunctionWrite() function (/core/s7_server.cpp) of snap7 v1.4.3 allows attackers to cause a Denial of Service (DoS) via a crafted packet.
References
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2026-06-29T00:00:00.000Z

Updated: 2026-06-30T13:34:14.581Z

Reserved: 2026-06-07T00:00:00.000Z

Link: CVE-2026-51218

cve-icon Vulnrichment

Updated: 2026-06-30T13:31:10.756Z

cve-icon NVD

No data.

cve-icon Redhat

No data.