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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.

PUBLISHED Reserved 2026-07-08 | Published 2026-07-08 | Updated 2026-07-09 | Assigner VulDB




MEDIUM: 5.3CVSS: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
MEDIUM: 6.3CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
MEDIUM: 6.3CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
5.8AV:A/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:ND/RC:UR

Problem types

Deserialization

Improper Input Validation

Product status

1.4.0
affected

1.4.1
affected

1.4.2
affected

1.4.3
affected

Timeline

2026-07-08:Advisory disclosed
2026-07-08:VulDB entry created
2026-07-09:VulDB entry last update

Credits

Chuan Wei finder

VULL (VulDB User) reporter

VULL (VulDB User) analyst

VulDB CNA Team coordinator

References

vuldb.com/vuln/376946 (VDB-376946 | davenardella snap7 ReadVar Request s7_server.cpp PerformFunctionRead deserialization) vdb-entry technical-description

vuldb.com/vuln/376946/cti (VDB-376946 | CTI Indicators (IOB, IOC, IOA)) signature permissions-required

vuldb.com/cve/CVE-2026-15105 (CVE-2026-15105 | CVE Analysis and Report) third-party-advisory

vuldb.com/submit/851026 (Submit #851026 | Davide Nardella Snap7 master(commit:30f37da3114024a71ba93f7fd855c680b97a406f) Stack-based Buffer Overflow) third-party-advisory

github.com/davenardella/snap7/issues/16 issue-tracking

github.com/user-attachments/files/28681740/poc.zip exploit

github.com/davenardella/snap7/ product

cve.org (CVE-2026-15105)

nvd.nist.gov (CVE-2026-15105)

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