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CVE-2026-111280

CVE-2026-111280 · snap7 through 1.4.3 Out-of-Bounds Write via TSnap7MicroClient::opReadArea

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 8.3 · High · EPSS 0.5%

Published
Updated

Stack: system

Affected products and versions

  • snap7

    Versions
    • ≥ 0, ≤ 1.4.3: Affected (custom)

    No fix published

  • snap7 Ubuntu:26.10

    Versions
    • 1.4.2+dfsg-1build1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • snap7 Ubuntu:26.04:LTS

    Versions
    • 1.4.2+dfsg-1
    • 1.4.2+dfsg-1build1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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