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.
Advisories

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Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 05 Aug 2026 03:15:00 +0000

Type Values Removed Values Added
Title Heap Buffer Overflow in snap7 TS7Worker Causing DoS

Sun, 02 Aug 2026 01:45:00 +0000

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

Thu, 30 Jul 2026 17:30:00 +0000

Type Values Removed Values Added
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'}

cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


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

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-07-30T16:50:13.496Z

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

Link: CVE-2026-51218

cve-icon Vulnrichment

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

cve-icon NVD

Status : Deferred

Published: 2026-06-29T23:16:42.623

Modified: 2026-07-30T19:18:05.107

Link: CVE-2026-51218

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-05T03:00:13Z

Weaknesses