Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/davenardella/snap7/blob/30f37da3114024a71ba93f7fd855c680b97a4
- https://github.com/davenardella/snap7/blob/30f37da3114024a71ba93f7fd855c680b97a4
- https://github.com/davenardella/snap7/pull/41
- https://www.vulncheck.com/advisories/snap7-through-1.4.3-out-of-bounds-write-via
FAQ
What is CVE-2026-115723?
CVE-2026-115723 is a vulnerability with a CVSS score of 7.4 (HIGH). 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 ...
How severe is CVE-2026-115723?
CVE-2026-115723 has been rated HIGH with a CVSS base score of 7.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-115723?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.