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CVE-2026-111280Published

snap7 through 1.4.3 Out-of-Bounds Write via TSnap7MicroClient::opReadArea

Exact source revision recorded 29 Oct 2026 18:12:12 UTC. It does not establish the source's current position. Latest evidence.

Recorded JSON

cve-program · CVE-2026-111280

Published

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.

Source published
15 Oct 2026 21:43:24 UTC
Source modified
29 Oct 2026 16:55:58 UTC
Observed here
29 Oct 2026 18:12:12 UTC
Source terms
CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: cve-program · CVE Program Terms of Use. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 4.0 · 8.3 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

CVSS 3.1 · 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H

ChangeIntel

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Sources read 7 Nov 05:48 UTC · 275 of 275 readable · 274 fully read · documentation 469/469 current

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