CVE-2026-111280

snap7 through 1.4.3 Out-of-Bounds Write via TSnap7MicroClient::opReadArea

Published Oct 15, 2026 CVSS 4.0 · 8.3 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', '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
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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Oct 29, 2026, 4:55 PM
Reserved
Oct 15, 2026, 7:56 PM
Status
Deferred
Published
Oct 15, 2026, 10:19 PM
Modified
Oct 23, 2026, 8:17 PM