CVE-2026-111280: falha de alta gravidade em davenardella snap7
snap7 through 1.4.3 Out-of-Bounds Write via TSnap7MicroClient::opReadArea
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21Vexday Risk Score
Sem sinal de exploração. Nenhum artefato público de exploração conhecido até agora.
ssvc Trackcvss 8.3epss 0.5%
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/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
Produtos afetados
davenardella · snap7CVEs relacionadas — davenardella snap7
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CVE-2026-115723HIGHSnap7 through 1.4.3 Out-of-Bounds Write via BRecv and CheckAsBRecvCompletionEPSS 0.4%CVE-2026-90572MEDIUMdavenardella snap7 s7_micro_client.cpp opUpload memory corruptionEPSS 0.4%CVE-2026-16225MEDIUMdavenardella snap7 s7_peer.cpp NegotiatePDULength out-of-bounds writeEPSS 0.4%CVE-2026-15105MEDIUMdavenardella snap7 ReadVar Request s7_server.cpp PerformFunctionRead out-of-bounds writeEPSS 0.4%
Referências
https://github.com/davenardella/snap7https://github.com/davenardella/snap7/blob/30f37da3114024a71ba93f7fd855c680b97a406f/src/core/s7_micro_client.cpp#L136-L150https://github.com/davenardella/snap7/issues/31https://www.vulncheck.com/advisories/snap7-through-1.4.3-out-of-bounds-write-via-tsnap7microclient-opreadarea