CVE-2019-5177Public exploit

Code execution via unbounded domainname formatting

Published Mar 11, 2020 · Updated Aug 4, 2024

Stack buffer overflow in the iocheckd service in WAGO PFC200 firmware 03.02.02(14) allows local users to execute code via crafted cache data. While parsing /tmp/iocheckCache.xml, iocheckd passes an overlong domainname value to sprintf() when building an edit_dns_server command, overflowing the 1,024-byte stack buffer at sp+0x440. Exploitation requires write access to the world-writable cache and a BC_SaveParameter trigger; demonstrated outcomes include service crash and attacker-controlled code execution.

CVSS severity8.8
High
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in the iocheckd service in WAGO PFC200 firmware 03.02.02(14) allows local users to execute code via crafted cache data. While parsing /tmp/iocheckCache.xml, iocheckd passes an overlong domainname value to sprintf() when building an edit_dns_server command, overflowing the 1,024-byte stack buffer at sp+0x440. Exploitation requires write access to the world-writable cache and a BC_SaveParameter trigger; demonstrated outcomes include service crash and attacker-controlled code execution.

The record

CVE
CVE-2019-5177
Published
Mar 11, 2020
Updated
Aug 4, 2024
Vendor
WAGO
Product
WAGO PFC200
Classifications
CWE-787, CWE-120, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 11, 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 03.02.02(14)

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

WAGO · WAGO PFC200version=Firmware version 03.02.02(14)

Published CVSS scores

8.8Cisco TalosCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
2.1NIST NVDAV:L/AC:L/Au:N/C:N/I:N/A:P

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1068Exploitation for Privilege Escalation

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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