Description
snap7 through 1.4.3 contains an out-of-bounds write vulnerability in TSnap7MicroClient::opReadArea() that allows malicious S7 peers to overflow client buffers via an unchecked DataLength field. Rogue or impersonated PLCs can return crafted ReadVar responses causing memcpy of up to 65535 bytes into caller buffers, crashing SCADA, HMI, or gateway processes and corrupting memory.
Published: 2026-10-15
Score: 8.3 High
EPSS: < 1% Very Low
KEV: No
AI Analysis

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Remediation

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Tracking

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Advisories

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History

Fri, 23 Oct 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Fri, 23 Oct 2026 12:45:00 +0000

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

Thu, 15 Oct 2026 22:00:00 +0000

Type Values Removed Values Added
Description snap7 through 1.4.3 contains an out-of-bounds write vulnerability in TSnap7MicroClient::opReadArea() that allows malicious S7 peers to overflow client buffers via an unchecked DataLength field. Rogue or impersonated PLCs can return crafted ReadVar responses causing memcpy of up to 65535 bytes into caller buffers, crashing SCADA, HMI, or gateway processes and corrupting memory.
Title snap7 through 1.4.3 Out-of-Bounds Write via TSnap7MicroClient::opReadArea
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

Davenardella Snap7
Snap7 Project Snap7
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-23T19:56:20.321Z

Reserved: 2026-10-15T19:56:08.790Z

Link: CVE-2026-111280

cve-icon Vulnrichment

Updated: 2026-10-23T19:56:00.823Z

cve-icon NVD

Status : Deferred

Published: 2026-10-15T22:19:29.317

Modified: 2026-10-23T20:17:19.987

Link: CVE-2026-111280

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-23T12:30:11Z

Weaknesses