{"id":"CVE-2026-111280","title":"snap7 through 1.4.3 Out-of-Bounds Write via TSnap7MicroClient::opReadArea","summary":"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 craft…","severity":"high","cvss":7.4,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H","cvssSource":"cna","cwe":["CWE-787"],"vendor":"davenardella","product":"snap7","affected":["snap7 <= 1.4.3"],"published":"2026-10-15","updated":"2026-10-15","sourceUpdated":"2026-10-15T21:43:24.650Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-111280","references":[{"url":"https://github.com/davenardella/snap7/issues/31"},{"url":"https://github.com/davenardella/snap7/blob/30f37da3114024a71ba93f7fd855c680b97a406f/src/core/s7_micro_client.cpp#L136-L150"},{"url":"https://github.com/davenardella/snap7"},{"url":"https://www.vulncheck.com/advisories/snap7-through-1.4.3-out-of-bounds-write-via-tsnap7microclient-opreadarea","label":"VulnCheck Advisory: snap7 through 1.4.3 Out-of-Bounds Write via TSnap7MicroClient::opReadArea"}],"tags":["cve.org"],"ingestedAt":"2026-10-15T22:48:25.449Z","slug":"CVE-2026-111280","body":"## Overview\n\nsnap7 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.\n\n## Affected\n\n- `snap7 <= 1.4.3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":40.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}