CVE-2026-51218

Heap Buffer Overflow in snap7 TS7Worker Causing DoS

Published Jun 29, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
Title Heap Buffer Overflow in snap7 TS7Worker Causing DoS
Type Values Removed Values Added
Title Heap Buffer Overflow in snap7 TS7Worker Function Causes Denial of Service
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'}

Type Values Removed Values Added
First Time appeared Davenardella
Davenardella snap7
Vendors & Products Davenardella
Davenardella snap7
Type Values Removed Values Added
Title Heap Buffer Overflow in snap7 TS7Worker Function Causes Denial of Service
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'}

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
Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Jul 30, 2026, 4:50 PM
Reserved
Jun 7, 2026, 12:00 AM
Status
Deferred
Published
Jun 29, 2026, 11:16 PM
Modified
Jul 30, 2026, 7:18 PM