Is CVE-2019-5186 actively exploited?

No active exploitation of CVE-2019-5186 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2019-5186 be exploited remotely?

No. CVE-2019-5186 requires local access to exploit.

What is the CVSS score of CVE-2019-5186?

CVE-2019-5186 has a CVSS score of 7.0 (HIGH).

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HIGH

CVE-2019-5186

CWE-120Published: March 23, 2020· Updated: Jun 17, 2026

7.0

CVSS v3.1

Official Description

An exploitable stack buffer overflow vulnerability vulnerability exists in the iocheckd service "I/O-Check" functionality of WAGO PFC 200. An attacker can send a specially crafted packet to trigger the parsing of this cache file.At 0x1eb9c the extracted interface element name from the xml file is used as an argument to /etc/config-tools/config_interfaces interface=<contents of interface element> using sprintf(). The destination buffer sp+0x40 is overflowed with the call to sprintf() for any interface values that are greater than 512-len("/etc/config-tools/config_interfaces interface=") in length. Later, at 0x1ea08 strcpy() is used to copy the contents of the stack buffer that was overflowed sp+0x40 into sp+0x440. The buffer sp+0x440 is immediately adjacent to sp+0x40 on the stack. Therefore, there is no NULL termination on the buffer sp+0x40 since it overflowed into sp+0x440. The strcpy() will result in invalid memory access. An interface value of length 0x3c4 will cause the service to crash.

NVD Source

Technical Analysis

CVE-2019-5186 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.0.