CVE-2019-5178

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2020-03-12 · updated 2026-06-17
Weakness: CWE-787

Description

An exploitable stack buffer overflow vulnerability vulnerability exists in the iocheckd service ‘I/O-Check’ functionality of WAGO PFC 200 Firmware version 03.02.02(14). An attacker can send a specially crafted packet to trigger the parsing of this cache file. The destination buffer sp+0x440 is overflowed with the call to sprintf() for any hostname values that are greater than 1024-len(‘/etc/config-tools/change_hostname hostname=‘) in length. A hostname value of length 0x3fd will cause the service to crash.

Affected products

WAGO PFC200: 03.02.02(14)

References

https://talosintelligence.com/vulnerability_reports/TALOS-2019-0963
https://talosintelligence.com/vulnerability_reports/TALOS-2019-0963

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