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/s7server.cpp of the component ReadVar Request Handler. This manipulation causes out-of-bounds write. The attack requires access to the local network. The exploit...

PT-2026-56618

Name of the Vulnerable Software and Affected Versions davenardella snap7 versions prior to 1.4.4 Description A flaw in the ReadVar Request Handler component allows for deserialization. The issue resides in the TS7Worker::PerformFunctionRead function within the src/core/s7 server.cpp file...

CVE-2026-51218

A heap buffer overflow in the TS7Worker::PerformFunctionWrite function /core/s7server.cpp of snap7 v1.4.3 allows attackers to cause a Denial of Service DoS via a crafted packet...

CVE-2026-51218

A heap buffer overflow in the TS7Worker::PerformFunctionWrite function /core/s7server.cpp of snap7 v1.4.3 allows attackers to cause a Denial of Service DoS via a crafted packet...

PT-2026-53751

Name of the Vulnerable Software and Affected Versions snap7 version 1.4.3 Description A heap buffer overflow occurs in the TS7Worker::PerformFunctionWrite function located in /core/s7 server.cpp. This issue allows an attacker to trigger a Denial of Service DoS by sending a specially crafted packe...

Anyone can call the perform function because there is no access control

Lines of code L31-L75 Vulnerability details Impact Anyone can call the perform function. It can lead to unauthorized changes in the security council. Proof of Concept There is no access control in the perform function and it is marked "external". function performaddress securityCouncil, address...

Anyone can change the members of Security Council

Lines of code Vulnerability details Impact Anyone can change the members of security council by calling the function perform in the contract SecurityCouncilMemberSyncAction.sol as the function is open to all. Proof of Concept uint256 updateNonce = getUpdateNoncesecurityCouncil; if nonce =...

The upgrade executor is granted the canceller role instead of the new emergency security council.

Lines of code Vulnerability details Impact In L1SCMgmtActivationAction.sol, the perform function is not granting role to the new emergency security council. It instead grants it to the upgrade executor. This logic doesn't align with the function inline comment and can prevent the perform function...