CVE-2026-111280: Out-of-bounds Write in davenardella snap7
Description
snap7 versions up to and including 1.4.3 have an out-of-bounds write vulnerability in the TSnap7MicroClient::opReadArea() function. This flaw allows malicious or impersonated S7 peers to overflow client buffers by exploiting an unchecked DataLength field in ReadVar responses. The vulnerability can cause memory corruption and crashes in SCADA, HMI, or gateway processes that use snap7.
CVSS v4.0
Score 8.3high
Affected software
davenardella
snap7
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-111280 is an out-of-bounds write vulnerability in snap7 through version 1.4.3, specifically in the TSnap7MicroClient::opReadArea() method. Malicious S7 peers can send crafted ReadVar responses with a DataLength field that is unchecked, leading to memcpy operations of up to 65535 bytes into client buffers. This buffer overflow can crash critical industrial control system components such as SCADA, HMI, or gateway processes and cause memory corruption.
Potential Impact
Successful exploitation allows a remote attacker, without privileges or user interaction, to cause denial of service by crashing SCADA, HMI, or gateway processes. It also risks memory corruption, which could potentially lead to further instability or exploitation in affected systems.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-15T19:56:08.790Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ad14e2f2cdf04f6566084f8
Added to database: 10/15/2026, 22:05:35 UTC
Last enriched: 10/15/2026, 22:33:58 UTC
Last updated: 10/15/2026, 22:33:58 UTC
Views: 2
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