CVE-2026-111280CWE-787

CVE-2026-111280

High · published October 16, 2026

CVSS v3.1
7.4
EPSS
0%
Percentile
35.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.4 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
CVSS v4.0
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
EPSS
0.00425 · 35.8th percentile
Weakness
CWE-787 · Out-of-bounds Write
Published
2026-10-16T02:19Z
References (5)
https://github.com/davenardella/snap7 · [email protected]https://github.com/davenardella/snap7/blob/30f37da3114024a71ba93f7fd855c680b97a406f/src/core/s7_micro_client.cpp#L136-L150 · [email protected]https://github.com/davenardella/snap7/issues/31 · [email protected]https://www.vulncheck.com/advisories/snap7-through-1.4.3-out-of-bounds-write-via-tsnap7microclient-opreadarea · [email protected]https://github.com/davenardella/snap7/issues/31 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 17 OCT 03:28Z
    EPSS moved — → 0%
    epss
  • 15 OCT 21:43Z
    snap7 through 1.4.3 Out-of-Bounds Write via TSnap7MicroClient::opReadArea
    cvelistv5
  • 15 OCT 21:43Z
    snap7 through 1.4.3 Out-of-Bounds Write via TSnap7MicroClient::opReadArea
    cvelistv5