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CVE-2026-111280

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

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.

CVSS 4.0 · 8.3 High EPSS < 1% KEV · Not listed
Vendors
Davenardella Snap7 Project
Products
Snap7 Snap7
CVE-2026-90572

davenardella snap7 s7_micro_client.cpp opUpload memory corruption

A vulnerability was determined in davenardella snap7 up to 1.4.3. The affected element is the function TSnap7MicroClient::opUpload of the file src/core/s7_micro_client.cpp. Executing a manipulation of the argument DataLen can lead to memory corruption. The attack can be executed remotely. The exploit has been publicly disclosed and may be utilized. The project was informed of the problem early through an issue report but has not responded yet.

CVSS 4.0 · 5.1 Medium EPSS < 1% KEV · Not listed
Vendors
Davenardella
Products
Snap7
CVE-2026-51218

Heap Buffer Overflow in snap7 TS7Worker Causing DoS

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.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Davenardella
Products
Snap7
CVE-2026-15105

davenardella snap7 ReadVar Request s7_server.cpp PerformFunctionRead out-of-bounds write

A flaw has been found in davenardella snap7 up to 1.4.3. This affects the function TS7Worker::PerformFunctionRead of the file src/core/s7_server.cpp of the component ReadVar Request Handler. This manipulation causes out-of-bounds write. The attack requires access to the local network. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Davenardella
Products
Snap7
CVE-2026-16225

davenardella snap7 s7_peer.cpp NegotiatePDULength out-of-bounds write

A security flaw has been discovered in davenardella snap7 up to 1.4.3. The impacted element is the function TSnap7Peer::NegotiatePDULength of the file src/core/s7_peer.cpp. The manipulation of the argument PDULength results in out-of-bounds write. The attack can be executed remotely. The exploit has been released to the public and may be used for attacks.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Davenardella
Products
Snap7