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

Quick assessment

Affected
davenardella snap7
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

snap7 1.4.3 及更早版本中存在一个越界写入漏洞，位于 TSnap7MicroClient::opReadArea() 函数中。该漏洞允许恶意的 S7 对等方通过未经验证的 DataLength 字段溢出客户端缓冲区。恶意或假冒的 PLC 可以返回精心构造的 ReadVar 响应，导致最多 65535 字节的数据被 memcpy 到调用者的缓冲区中，从而造成 SCADA、HMI 或网关进程崩溃，并导致内存损坏。

CVSS 7.4 · High EPSS 0.43% · P35

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
davenardella snap7 ≤ 1.4.3 affected
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I. Basic Information for CVE-2026-111280

Vulnerability Information
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Vulnerability Title
snap7 through 1.4.3 Out-of-Bounds Write via TSnap7MicroClient::opReadArea
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
davenardella snap7 0 ~ 1.4.3 -

II. Public POCs for CVE-2026-111280

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III. Intelligence Information for CVE-2026-111280

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Vendor Advisories for CVE-2026-111280 (1)

Proof of Concept for CVE-2026-111280 (1)

Vendor Pages for CVE-2026-111280 (1)

IV. Related Vulnerabilities

Same product: snap7
Same vendor: davenardella
Same weakness: CWE-787

V. Comments for CVE-2026-111280

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