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Thu, November 20, 2025

Emerson Appleton UPSMON-PRO Stack Overflow, RCE

Emerson's Appleton UPSMON-PRO contains a stack-based buffer overflow that can be triggered remotely via UDP port 2601. A crafted UDP packet can overwrite stack memory and enable arbitrary code execution with SYSTEM privileges if UPSMONProService traffic is not validated; the issue is tracked as CVE-2024-3871 and carries high severity (CVSS v3.1 9.8; CVSS v4 9.3). Affected versions are 2.6 and earlier; Emerson lists the product as End of Life, and CISA advises replacing unsupported units or applying mitigations such as blocking UDP 2601, isolating monitoring networks, filtering oversized packets, and monitoring for service crashes.

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