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.

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Access Vector Adjacent Network

Access Complexity Low

Authentication None

Confidentiality Impact Partial

Integrity Impact Partial

Availability Impact Partial

This CVE is not in the KEV list.

The EPSS score is 0.00286.

Exploitation poc

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
davenardella snap7 affected
Version Status Constraints
1.4.0 affected —
1.4.1 affected —
1.4.2 affected —
1.4.3 affected —

No data.

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors Products
Davenardella Subscribe
Snap7 Subscribe

Project Subscriptions

Vendors Products
Davenardella Subscribe
Snap7 Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/davenardella/snap7/ cve-icon
https://github.com/davenardella/snap7/issues/16 cve-icon
https://github.com/user-attachments/files/28681740/poc.zip cve-icon
https://vuldb.com/cve/CVE-2026-15105 cve-icon
https://vuldb.com/submit/851026 cve-icon
https://vuldb.com/vuln/376946 cve-icon
https://vuldb.com/vuln/376946/cti cve-icon
History

Sat, 01 Aug 2026 15:15:00 +0000

Type Values Removed Values Added
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 deserialization. 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. 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.
Title davenardella snap7 ReadVar Request s7_server.cpp PerformFunctionRead deserialization davenardella snap7 ReadVar Request s7_server.cpp PerformFunctionRead out-of-bounds write
Weaknesses CWE-20
CWE-502		 CWE-119
CWE-787

Thu, 09 Jul 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 08 Jul 2026 22:30:00 +0000

Type Values Removed Values Added
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 deserialization. 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.
Title davenardella snap7 ReadVar Request s7_server.cpp PerformFunctionRead deserialization
First Time appeared Davenardella
Davenardella snap7
Weaknesses CWE-20
CWE-502
CPEs cpe:2.3:a:davenardella:snap7:*:*:*:*:*:*:*:*
Vendors & Products Davenardella
Davenardella snap7
References
Metrics cvssV2_0

{'score': 5.8, 'vector': 'AV:A/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:ND/RC:UR'}

cvssV3_0

{'score': 6.3, 'vector': 'CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R'}

cvssV3_1

{'score': 6.3, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R'}

cvssV4_0

{'score': 5.3, 'vector': 'CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P'}

Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: VulDB

Published:

Updated: 2026-08-01T14:56:11.532Z

Reserved: 2026-07-08T17:07:19.722Z

Link: CVE-2026-15105

cve-icon Vulnrichment

Updated: 2026-07-09T13:21:32.397Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-29T13:15:05Z

Weaknesses