CVE-2021-20986

mediumpriority · track · 30EPSS 0.010 · 64 %ileDEEUUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
1.04% (64th) EPSS
CVSS 5 · medium
Is it mine?
99 products
Check your exposure
Who says so?
4 sources
cnnvd · enisa_euvd · nvd · pepperl_fuchs_psirt

EPSS · scored 2026-10-27

A Denial of Service vulnerability was found in Hilscher PROFINET IO Device V3 in versions prior to V3.14.0.7. This may lead to unexpected loss of cyclic communication or interruption of acyclic communication.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

No vendor fix yet; a mitigation is available.

  • Mitigationpepperl_fuchs_psirt

    An external protective measure is required. - Minimize network exposure for affected products and ensure that they are not accessible via the Internet. - Isolate affected products from the corporate network. - If remote access is required, use secure methods such as virtual private networks (VPNs).

  • Mitigationpepperl_fuchs_psirt

    An external protective measure is required. Minimize network exposure for affected products and ensure that they are not accessible via the Internet. Isolate affected products from the corporate network. If remote access is required, use secure methods such as virtual private networks (VPNs).

02

cvss

Technical severity, 0–10. One row per scoring source.

7.5
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 2.9
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · ENISA EU
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · info@cert.vde.comexploitability 3.9 · impact 3.6
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · Pepperl+Fuchs PSIRT DE
v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-787USprimaryCWE-787US
04

affected products (99)

Products and version ranges known to be affected.

showing 20 of 99
05

advisories (2)

Vendor and ecosystem advisories describing this.

  • VDE-2021-006Pepperl+Fuchs: Multiple Products - Vulnerability may allow remote attackers to cause a Denial Of Service2021-11-16csaf · pepperl_fuchs_psirtDE

    Critical vulnerability has been discovered in the utilized component PROFINET IO Device by Hilscher Gesellschaft für Systemautomation mbH. The impact of the vulnerability on the affected device is that it can - no longer perform acyclic requests - may drop all established cyclic connections may - disappear completely from the network. For more information see advisory by Hilscher: https://kb.hilscher.com/display/ISMS/2020-12-03+Denial+of+Service+vulnerability+in+PROFINET+IO+Device Update 20.11.2024: Products have been added

  • VDE-2021-018Pepperl+Fuchs: Multiple vulnerabilites in ICE1 Ethernet IO Modules2021-05-12csaf · pepperl_fuchs_psirtDE

    Critical vulnerability has been discovered in the utilized components rcX, mbedTLS, PROFINET IO Device and EtherNet/IP Core by Hilscher Gesellschaft für Systemautomation mbH. The impact of the vulnerabilities on the affected device is that it can result in: * Denial of Service (DoS) * Remote Code Execution (RCE) * Code Exposure **Note:** ICE1-8IOL-S2-G60L-V1D (70103603) is not affected by CVE-2021-20986

06

also known as (3)

Other names and identifiers for this entity.

07

sources

Which sources assert this record, and when.

cnnvdenisa_euvdnvdpepperl_fuchs_psirtNVDCVE.orgMITRE
published 2021-02-16modified 2026-06-17
09

references (7)

External citations — patches, advisories, analysis.

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