CVE-2026-111280: fallo de gravedad alta en davenardella snap7
snap7 through 1.4.3 Out-of-Bounds Write via TSnap7MicroClient::opReadArea
Publicada el · Actualizada el
Aviso por correo cuando entre en el KEV, tenga PoC pública o suba de nota.
21Vexday Risk Score
Sin señal de explotación. Ningún artefacto público de explotación conocido hasta ahora.
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
Productos afectados
davenardella · snap7CVEs relacionadas — davenardella snap7
En el mismo producto, de las más peligrosas a las menos.
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%
Referencias
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