CVE-2023-51440

HIGH
7.5
CVSS Score
Published: February 13, 2024 at 09:00 AM UTC
Updated: June 17, 2026 at 06:40 AM UTC
8 products affected across 1 vendorSIMATIC Cp 343-1 FirmwareSIMATIC Cp 343-1 Lean FirmwareSiplus .NET Cp 343-1 Firmware

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Severity
HIGH7.5
Exploit prediction
EPSS 0.6%
SSVC
No known exploit

Description

A vulnerability has been identified in SIMATIC CP 343-1 (6GK7343-1EX30-0XE0) (All versions), SIMATIC CP 343-1 Lean (6GK7343-1CX10-0XE0) (All versions), SIPLUS NET CP 343-1 (6AG1343-1EX30-7XE0) (All versions), SIPLUS NET CP 343-1 Lean (6AG1343-1CX10-2XE0) (All versions). Affected products incorrectly validate TCP sequence numbers. This could allow an unauthenticated remote attacker to create a denial of service condition by injecting spoofed TCP RST packets.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

All versions
siemens-simatic-cp-343-1 (same device)
All versions
siemens-simatic-cp-343-1-lean (same device)
All versions
siemens-siplus-net-cp-343-1 (same device)
All versions
siemens-siplus-net-cp-343-1-lean (same device)
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHsiemens
Vector?

Quick Info

StatusANALYZED
CWE
CWE-940NVD-CWE-noinfo

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