CVE-2026-111280
snap7 through 1.4.3 Out-of-Bounds Write via TSnap7MicroClient::opReadArea
- State
- Published
- Severity
- 8.3 High
- Published
- Oct 15, 2026
- Updated
- Oct 29, 2026
- Reserved
- Oct 15, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.3 High | 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 | VulnCheck |
| 3.1 | 7.4 High | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H | VulnCheck |
Weaknesses
- CWE-787 Out-of-bounds Write
Affected Products
| Product | Versions |
|---|---|
snap7davenardella |
|
References
- https://github.com/davenardella/snap7/issues/31issue-tracking
- https://github.com/davenardella/snap7/blob/30f37da3114024a71ba93f7fd855c680b97a406f/src/core/s7_micro_client.cpp#L136-L150technical-description
- https://github.com/davenardella/snap7product
- VulnCheck Advisory: snap7 through 1.4.3 Out-of-Bounds Write via TSnap7MicroClient::opReadAreathird-party-advisory
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