What’s Vulnerable › Vulnerabilities

CVE-2023-51440

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-02-13 · updated 2026-06-17
• Weakness: CWE-940

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 products

• Siemens Simatic Cp 343-1 Firmware: all versions
• Siemens Simatic Cp 343-1 Lean Firmware: all versions
• Siemens Siplus Net Cp 343-1 Firmware: all versions
• Siemens Siplus Net Cp 343-1 Lean Firmware: all versions

References

• https://cert-portal.siemens.com/productcert/html/ssa-516818.html
• https://cert-portal.siemens.com/productcert/html/ssa-516818.html

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