GHSA-m2jh-hr35-v8vpHighCVSS 7.4
Snap7 through 1.4.3 contains an out-of-bounds write vulnerability in the passive partner that...
🔗 CVE IDs covered (1)
📋 Description
Snap7 through 1.4.3 contains an out-of-bounds write vulnerability in the passive partner that allows a malicious active partner to overflow application buffers by declaring an unvalidated BSend total length. Attackers connecting from the configured peer address can declare up to 65535 bytes and send a short fragment, causing BRecv to memcpy past the buffer and crash or corrupt SCADA, HMI or gateway processes.
🔗 References (6)
- https://nvd.nist.gov/vuln/detail/CVE-2026-115723
- https://github.com/davenardella/snap7/pull/41
- https://github.com/davenardella/snap7/blob/30f37da3114024a71ba93f7fd855c680b97a406f/src/core/s7_partner.cpp#L1126-L1166
- https://github.com/davenardella/snap7/blob/30f37da3114024a71ba93f7fd855c680b97a406f/src/core/s7_partner.cpp#L850-L867
- https://www.vulncheck.com/advisories/snap7-through-1.4.3-out-of-bounds-write-via-brecv-and-checkasbrecvcompletion
- https://github.com/advisories/GHSA-m2jh-hr35-v8vp