Heap Buffer Overflow in Snap7 Product by Davenardella
CVE-2026-51218

6.5MEDIUM

Key Information:

Vendor

Davenardella

Status
Snap7
Vendor
CVE Published:
29 June 2026

What is CVE-2026-51218?

A heap buffer overflow exists in the TS7Worker::PerformFunctionWrite() function within Snap7 v1.4.3. This vulnerability allows for potential Denial of Service (DoS) attacks when an attacker sends a maliciously crafted packet to the affected software. Exploitation of this flaw could result in significant disruption to the service, impacting operational continuity for users of this automation software.

References

https://github.com/davenardella/snap7
https://github.com/davenardella/snap7/issues/14

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.