CVE intelligence and bounded remediation
CVE-2019-5081 — Wago Pfc 200 Firmware security vulnerability
An exploitable heap buffer overflow vulnerability exists in the iocheckd service ''I/O-Chec'' functionality of WAGO PFC 200 Firmware version 03.01.07(13) and 03.00.39(12), and WAGO PFC100 Firmware version 03.00.39(12). A specially crafted set of packets can cause a heap buffer overflow, potentially resulting in code execution. An attacker can send unauthenticated packets to trigger this vulnerability.
- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Published
- 2019-12-18
- CISA KEV
- Not currently listed
- Ecosystem
- operating-system
- Weaknesses
- CWE-787
Affected products
- wago / pfc_200_firmware / 03.00.39(12)
- wago / pfc_200_firmware / 03.01.07(13)
- wago / pfc_100_firmware / 03.00.39(12)
Matched remediation archetype
Buffer bounds, memory safety, and memory corruption
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Check exposure
- Identify affected native-code versions, build flags, architectures, parsers, codecs, drivers, and input paths in all shipped artifacts.
- Determine whether untrusted data reaches the affected routine and the process privilege, sandbox, and network exposure.
- Confirm statically linked, vendored, firmware, and platform-provided copies, not only package-manager records.
Remediate safely
- Apply the maintained upstream correction or replace the affected component, then rebuild every dependent artifact from clean inputs.
- Adopt bounds-checked interfaces, validated sizes and integer conversions, clear ownership, and memory-safe components where practical.
- Enable supported compiler and runtime hardening and add sanitized tests and fuzz regression seeds derived from non-weaponized fixtures.
Authoritative sources
Complete CVE record and remediation plan
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