CVE-2020-12514Public exploitNetwork attack vector

Service crash via malformed discoveryd UDP packet

Published Jan 22, 2021 · Updated Sep 16, 2024

NULL pointer dereference in Comtrol IO-Link Master discoveryd 1.5.48 and earlier allows remote authenticated users to crash the service. The daemon passes data derived from a crafted UDP datagram on port 4606 to strlen with a null pointer, causing a segmentation fault. The CNA score requires high privileges, although the published proof of concept does not describe an authentication step; normal mode limits the demonstrated result to a program crash.

CVSS severity6.6
Medium
EPSS probability1.01%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Comtrol IO-Link Master discoveryd 1.5.48 and earlier allows remote authenticated users to crash the service. The daemon passes data derived from a crafted UDP datagram on port 4606 to strlen with a null pointer, causing a segmentation fault. The CNA score requires high privileges, although the published proof of concept does not describe an authentication step; normal mode limits the demonstrated result to a program crash.

The record

CVE
CVE-2020-12514
Published
Jan 22, 2021
Updated
Sep 16, 2024
Vendor
Pepperl+Fuchs
Product
Comtrol IO-Link Master
Classifications
CWE-476, T0814
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jan 22, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=unspecified <=1.5.48

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Pepperl+Fuchs · Comtrol IO-Link Masterversion=unspecified <=1.5.48

Published CVSS scores

6.6CERT@VDECVSS:3.1/AV:N/AC:H/PR:H/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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T0814Denial of Service

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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