CVE-2026-15105
davenardella snap7 ReadVar Request s7_server.cpp PerformFunctionRead out-of-bounds write
- State
- Published
- Severity
- 5.3 Medium
- Published
- Jul 8, 2026
- Updated
- Aug 1, 2026
- Reserved
- Jul 8, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.3 Medium | 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 | VulDB |
| 3.1 | 6.3 Medium | 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 | VulDB |
| 3.0 | 6.3 Medium | 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 | VulDB |
| 2.0 | 5.8 Medium | AV:A/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:ND/RC:UR | VulDB |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
snap7davenardella |
|
References
- VDB-376946 | davenardella snap7 ReadVar Request s7_server.cpp PerformFunctionRead out-of-bounds writevdb-entrytechnical-description
- VDB-376946 | CTI Indicators (IOB, IOC, IOA)signaturepermissions-required
- CVE-2026-15105 | CVE Analysis and Reportthird-party-advisory
- Submit #851026 | Davide Nardella Snap7 master(commit:30f37da3114024a71ba93f7fd855c680b97a406f) Stack-based Buffer Overflowthird-party-advisory
- https://github.com/davenardella/snap7/issues/16issue-tracking
- https://github.com/user-attachments/files/28681740/poc.zipexploit
- https://github.com/davenardella/snap7/product
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.