CVE-2026-115723 — Snap7 through 1.4.3 Out-of-Bounds Write via BRecv and CheckAsBRecvCompletion
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 u…
Published: 2026-10-23 · CVSS: 8.3 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7