CVE-2026-111280 — snap7 through 1.4.3 Out-of-Bounds Write via TSnap7MicroClient::opReadArea
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 D…
Published: 2026-10-15 · CVSS: 8.3 · CVSS 4.0
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: CVE Program · Revision 360713b39703b2034cd81a11b5d059bba3218932