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CVE-2025-41703: Phoenix Contact: UPS Shutdown via Unauthenticated Modbus Command

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-14 · updated 2026-10-18
• Weakness: CWE-306

Description

An unauthenticated remote attacker can cause a Denial of Service by turning off the output of the UPS via Modbus command.

Affected products

• Phoenix Contact QUINT4-UPS/24DC/24DC/10/EIP: from VC:00 through VC:07
• Phoenix Contact QUINT4-UPS/24DC/24DC/20/EIP: from VC:00 through VC:07
• Phoenix Contact QUINT4-UPS/24DC/24DC/40/EIP: from VC:00 through VC:07
• Phoenix Contact QUINT4-UPS/24DC/24DC/5/EIP: from VC:00 through VC:07

References

• https://certvde.com/de/advisories/VDE-2025-072
• http://seclists.org/fulldisclosure/2025/Oct/12

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