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TI-2026-12717 Aliases CVE-2026-15105GHSA-x9cg-5m94-27cv

davenardella snap7 ReadVar Request s7_server.cpp PerformFunctionRead out-of-bounds write

Priority MEDIUM 57CWE-119Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
Low · Low · Low
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00377 31st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
davenardellasnap71.4.0; 1.4.1; 1.4.2; 1.4.3—No fix listedCNA
  • snap7 Vendordavenardella Affected 1.4.0; 1.4.1; 1.4.2; 1.4.3 Fixed in — No fix listed CNA

CPE names CNA · 1

CPEVersionsRoleVendor
cpe:2.3:a:davenardella:snap7:*:*:*:*:*:*:*:*——davenardella
  • cpe:2.3:a:davenardella:snap7:*:*:*:*:*:*:*:* Versions — — ·davenardella

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-15105
  2. 2026-10-03 Alias added: GHSA-x9cg-5m94-27cv

References

Exploit 1

Other 2

  • TI-2026-75061 snap7 Out-of-Bounds Write via TSnap7MicroClient::opReadArea CVSS 4.0HIGH 8.3
  • TI-2026-13566 davenardella snap7 s7_peer.cpp NegotiatePDULength out-of-bounds write CVSS 4.0MEDIUM 5.3
  • TI-2026-61586 davenardella snap7 s7_micro_client.cpp opUpload memory corruption CVSS 4.0MEDIUM 5.1
  • TI-2026-79727 Out-of-bounds write in Snap7 lets connected peers overflow buffers CVSS 4.0HIGH 8.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences