Description
Snap7 through 1.4.3 contains an out-of-bounds write vulnerability in the passive partner that allows a malicious active partner to overflow application buffers by declaring an unvalidated BSend total length. Attackers connecting from the configured peer address can declare up to 65535 bytes and send a short fragment, causing BRecv to memcpy past the buffer and crash or corrupt SCADA, HMI or gateway processes.
Published: 2026-10-23
Score: 8.3 High
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Fri, 23 Oct 2026 12:00:00 +0000

Type Values Removed Values Added
Description Snap7 through 1.4.3 contains an out-of-bounds write vulnerability in the passive partner that allows a malicious active partner to overflow application buffers by declaring an unvalidated BSend total length. Attackers connecting from the configured peer address can declare up to 65535 bytes and send a short fragment, causing BRecv to memcpy past the buffer and crash or corrupt SCADA, HMI or gateway processes.
Title Snap7 through 1.4.3 Out-of-Bounds Write via BRecv and CheckAsBRecvCompletion
First Time appeared Snap7 Project
Snap7 Project snap7
Weaknesses CWE-787
CPEs cpe:2.3:a:snap7_project:snap7:*:*:*:*:*:*:*:*
Vendors & Products Snap7 Project
Snap7 Project snap7
References
Metrics cvssV3_1

{'score': 7.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H'}

cvssV4_0

{'score': 8.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N'}


Subscriptions

Snap7 Project Snap7
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-23T11:36:47.011Z

Reserved: 2026-10-23T11:26:42.748Z

Link: CVE-2026-115723

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-10-23T12:18:12.983

Modified: 2026-10-23T13:19:13.150

Link: CVE-2026-115723

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-23T13:30:07Z

Weaknesses