davenardella snap7 up to 1.4.3 ReadVar Request src/core/s7_server.cpp PerformFunctionRead deserialization

CVSS Meta Temp Score
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CTI Interest Score
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5.7$0-$5k1.15+

Summaryinfo

A vulnerability labeled as critical has been found in davenardella snap7 up to 1.4.3. This impacts the function TS7Worker::PerformFunctionRead of the file src/core/s7_server.cpp of the component ReadVar Request Handler. Such manipulation leads to deserialization. This vulnerability is documented as CVE-2026-15105. The attack requires being on the local network. Additionally, an exploit exists. The project was informed of the problem early through an issue report but has not responded yet.

Detailsinfo

A vulnerability was found in davenardella snap7 up to 1.4.3. It has been rated as critical. Affected by this issue is the function TS7Worker::PerformFunctionRead of the file src/core/s7_server.cpp of the component ReadVar Request Handler. The manipulation with an unknown input leads to a deserialization vulnerability. Using CWE to declare the problem leads to CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. Impacted is confidentiality, integrity, and availability.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-15105. The exploitation is known to be easy. The attack needs to be done within the local network. No form of authentication is required for exploitation. Technical details as well as a public exploit are known.

The exploit is available at github.com. It is declared as proof-of-concept. The project was informed of the problem early through an issue report but has not responded yet.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 5.7

VulDB Base Score: 6.3
VulDB Temp Score: 5.7
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Deserialization
CWE: CWE-502 / CWE-20
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

07/08/2026 Advisory disclosed
07/08/2026 +0 days VulDB entry created
07/08/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: 16
Status: Not defined

CVE: CVE-2026-15105 (🔒)
GCVE (CVE): GCVE-0-2026-15105
GCVE (VulDB): GCVE-100-376946
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 07/08/2026 19:12
Changes: 07/08/2026 19:12 (58)
Complete: 🔍
Submitter: VULL
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #851026: Davide Nardella Snap7 master(commit:30f37da3114024a71ba93f7fd855c680b97a406f) Stack-based Buffer Overflow (by VULL)

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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