CVE-2019-5082Public exploitNetwork attack vector

Unauthenticated code execution via fixed-size heap copy

Published Jan 8, 2020 · Updated Aug 4, 2024

Heap buffer overflow in WAGO PFC100 and PFC200 firmware allows remote attackers to execute code through unauthenticated I/O-Check packets. ReadPCBManuNum copies the attacker-controlled WAGONRSTR EEPROM value with strcpy into a 40-byte heap allocation without checking its length. No credentials or user interaction are required; affected builds are PFC100 03.00.39(12) and PFC200 03.00.39(12) and 03.01.07(13).

CVSS severity10.0
Critical
EPSS probability3.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in WAGO PFC100 and PFC200 firmware allows remote attackers to execute code through unauthenticated I/O-Check packets. ReadPCBManuNum copies the attacker-controlled WAGONRSTR EEPROM value with strcpy into a 40-byte heap allocation without checking its length. No credentials or user interaction are required; affected builds are PFC100 03.00.39(12) and PFC200 03.00.39(12) and 03.01.07(13).

The record

CVE
CVE-2019-5082
Published
Jan 8, 2020
Updated
Aug 4, 2024
Vendor
WAGO
Product
WAGO PFC100 Firmware
Classifications
CWE-120, CWE-787, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 8, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Firmware version 03.00.39(12)

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

WAGO · WAGO PFC100 Firmwareversion=Firmware version 03.00.39(12)
WAGO · WAGO PFC200 Firmwareversion=Firmware version 03.00.39(12); version=Firmware version 03.01.07(13)

Published CVSS scores

10.0Cisco TalosCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H
7.5NIST National Vulnerability DatabaseAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-787Out-of-bounds Write
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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