CVE-2020-12514 | Pepper+Fuchs Comtrol IO-Link Master NULL Pointer Dereference

Pepperl+Fuchs Comtrol IO-Link Master in Version 1.5.48 and below is prone to a NULL Pointer Dereference that leads to a DoS in discoveryd

Published: 2021-01-22 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-12514 is rated Moderate Risk (47.5/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.01%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-12514

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.45% 1.01% +0.56%
2 2025-03-30 0.88% 0.45% -0.43%
3 2025-03-29 — 0.88% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-12514

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.6 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:H)
They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 0.7 5.9 [email protected]
4.9 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:H)
They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.2 3.6 [email protected]
4.0 2.0 MEDIUM
AV:N/AC:L/Au:S/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.0 2.9 [email protected]

Weakness enumeration for CVE-2020-12514

Affected software / configurations for CVE-2020-12514

Vendor Product Version Raw CPE
pepperl-fuchs io-link_master_4-eip_firmware <= 1.5.48 cpe:2.3:o:pepperl-fuchs:io-link_master_4-eip_firmware:*:*:*:*:*:*:*:*
pepperl-fuchs io-link_master_8-eip_firmware <= 1.5.48 cpe:2.3:o:pepperl-fuchs:io-link_master_8-eip_firmware:*:*:*:*:*:*:*:*
pepperl-fuchs io-link_master_8-eip-l_firmware <= 1.5.48 cpe:2.3:o:pepperl-fuchs:io-link_master_8-eip-l_firmware:*:*:*:*:*:*:*:*
pepperl-fuchs io-link_master_dr-8-eip_firmware <= 1.5.48 cpe:2.3:o:pepperl-fuchs:io-link_master_dr-8-eip_firmware:*:*:*:*:*:*:*:*
pepperl-fuchs io-link_master_dr-8-eip-p_firmware <= 1.5.48 cpe:2.3:o:pepperl-fuchs:io-link_master_dr-8-eip-p_firmware:*:*:*:*:*:*:*:*
pepperl-fuchs io-link_master_dr-8-eip-t_firmware <= 1.5.48 cpe:2.3:o:pepperl-fuchs:io-link_master_dr-8-eip-t_firmware:*:*:*:*:*:*:*:*
pepperl-fuchs io-link_master_4-pnio_firmware <= 1.5.48 cpe:2.3:o:pepperl-fuchs:io-link_master_4-pnio_firmware:*:*:*:*:*:*:*:*
pepperl-fuchs io-link_master_8-pnio_firmware <= 1.5.48 cpe:2.3:o:pepperl-fuchs:io-link_master_8-pnio_firmware:*:*:*:*:*:*:*:*
pepperl-fuchs io-link_master_8-pnio-l_firmware <= 1.5.48 cpe:2.3:o:pepperl-fuchs:io-link_master_8-pnio-l_firmware:*:*:*:*:*:*:*:*
pepperl-fuchs io-link_master_dr-8-pnio_firmware <= 1.5.48 cpe:2.3:o:pepperl-fuchs:io-link_master_dr-8-pnio_firmware:*:*:*:*:*:*:*:*
pepperl-fuchs io-link_master_dr-8-pnio-p_firmware <= 1.5.48 cpe:2.3:o:pepperl-fuchs:io-link_master_dr-8-pnio-p_firmware:*:*:*:*:*:*:*:*
pepperl-fuchs io-link_master_dr-8-pnio-t_firmware <= 1.5.48 cpe:2.3:o:pepperl-fuchs:io-link_master_dr-8-pnio-t_firmware:*:*:*:*:*:*:*:*

References for CVE-2020-12514

cvelogic Threat Intelligence