CVE-2026-111280
snap7 through 1.4.3 Out-of-Bounds Write via TSnap7MicroClient::opReadArea
CVSS Score
7.4
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-787 |
| Vendor | davenardella |
| Product | snap7 |
| Published | Oct 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High
Affected Versions
davenardella / snap7
0 ≤ 1.4.3
References
github.com: https://github.com/davenardella/snap7/issues/31 github.com: https://github.com/davenardella/snap7/blob/30f37da3114024a71ba93f7fd855c680b97a406f/src/core/s7_micro_client.cpp#L136-L150 github.com: https://github.com/davenardella/snap7 vulncheck.com: https://www.vulncheck.com/advisories/snap7-through-1.4.3-out-of-bounds-write-via-tsnap7microclient-opreadarea
Credits
Mayur021 Shukhratbek Uraiimov