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CVE-2026-15105— davenardella snap7 ReadVar Request s7_server.cpp PerformFunctionRead out-of-bounds write

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.

Dave Nardella Snap7是Dave Nardella个人开发者的一个动态数据交换服务器软件。 Dave Nardella Snap7 1.4.3及之前版本存在安全漏洞，该漏洞源于src/core/s7_server.cpp文件中ReadVar Request Handler组件的TS7Worker::PerformFunctionRead函数存在反序列化问题，可能导致攻击者在本地网络访问下利用该漏洞。以下版本受到影响：1.4.0版本、1.4.1版本、1.4.2版本和1.4.3版本。

CVSS 6.3 · Medium EPSS 0.38% · P30

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 4

VendorProduct Version RangeStatus
davenardella snap7 1.4.0 affected
1.4.1 affected
1.4.2 affected
1.4.3 affected
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I. Basic Information for CVE-2026-15105

Vulnerability Information
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Vulnerability Title
davenardella snap7 ReadVar Request s7_server.cpp PerformFunctionRead out-of-bounds write
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw has been found in davenardella snap7 up to 1.4.3. This affects the function TS7Worker::PerformFunctionRead of the file src/core/s7_server.cpp of the component ReadVar Request Handler. This manipulation causes out-of-bounds write. The attack requires access to the local network. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
Dave Nardella Snap7 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Dave Nardella Snap7是Dave Nardella个人开发者的一个动态数据交换服务器软件。 Dave Nardella Snap7 1.4.3及之前版本存在安全漏洞，该漏洞源于src/core/s7_server.cpp文件中ReadVar Request Handler组件的TS7Worker::PerformFunctionRead函数存在反序列化问题，可能导致攻击者在本地网络访问下利用该漏洞。以下版本受到影响：1.4.0版本、1.4.1版本、1.4.2版本和1.4.3版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
davenardella snap7 1.4.0 cpe:2.3:a:davenardella:snap7:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-15105

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-15105

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Vendor Advisories for CVE-2026-15105 (1)

Other References for CVE-2026-15105 (1)

Other References for CVE-2026-15105 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-15105

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