CVE-2026-115723
High · 7.4CVSS
7.4
EPSS
0.4%
Published
Oct 23, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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