CVE-2026-111280: high-severity vulnerability in davenardella snap7
snap7 through 1.4.3 Out-of-Bounds Write via TSnap7MicroClient::opReadArea
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
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
Affected products
davenardella · snap7Related CVEs — davenardella snap7
In the same product, most dangerous first.
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%
References
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