Out-of-Bounds Write Vulnerability in Snap7 by Davenardella
CVE-2026-16225

5.3MEDIUM

Key Information:

Vendor

Davenardella

Status
Snap7
Vendor
CVE Published:
19 July 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-16225?

A significant security flaw exists in Snap7 by Davenardella affecting the function TSnap7Peer::NegotiatePDULength within the s7_peer.cpp file. The vulnerability arises from improper handling of the PDULength argument, leading to an out-of-bounds write condition. This flaw can be exploited remotely, and details regarding the exploit have been publicly released, raising concerns about potential attacks on affected systems. It is crucial for users of Snap7 to apply necessary updates or mitigations to protect against possible exploitation.

Affected Version(s)

snap7 1.4.0

snap7 1.4.1

snap7 1.4.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-16225 - Proof of Concept

References

https://vuldb.com/vuln/380047
vdb-entrytechnical-description
https://vuldb.com/vuln/380047/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-16225
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Chuan Wei
VULL (VulDB User)
VULL (VulDB User)
.