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CVE-2021-20986: A Denial of Service vulnerability was found in Hilscher PROFINET IO Device V3 in versions prior to V3.14.0.7

47
This month
HIGH 7.5REMOTEUPGRADEUPGRADEUPGRADE

CVE-2021-20986 is a high-severity flaw (CVSS 7.5) affecting profinet io device firmware, pgv100-f200a-b17-v1d firmware, pgv150i-f200a-b17-v1d firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

  • High severity
  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score7.5 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance1.0% (top 36%)
CISA exploited listNo
WeaknessCWE-787
Published2021-02-16
Last modified2026-06-17
Publisher (CNA): CERT VDE · Vendor: hilscher · pepperl-fuchs

Share: LinkedIn · X · Reddit

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

hilscher profinet io device firmware UPGRADE
Affected: >= 3.0 and < 3.14.0.7
Fixed in: 3.14.0.7
Safe to downgrade to: a release before 3.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
pepperl-fuchs pgv100-f200a-b17-v1d firmware UPGRADE
Affected: <= 2.0.0
Fixed in: newer than 2.0.0
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
pepperl-fuchs pgv150i-f200a-b17-v1d firmware UPGRADE
Affected: <= 2.0.0
Fixed in: newer than 2.0.0
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
pepperl-fuchs pgv100-f200-b17-v1d-7477 firmware UPGRADE
Affected: <= 2.0.0
Fixed in: newer than 2.0.0
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
pepperl-fuchs pxv100-f200-b17-v1d firmware UPGRADE
Affected: <= 4.2.0
Fixed in: newer than 4.2.0
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
pepperl-fuchs pxv100-f200-b17-v1d-3636 firmware UPGRADE
Affected: <= 4.2.0
Fixed in: newer than 4.2.0
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-20986?

profinet io device firmware: upgrade to 3.14.0.7; pgv100-f200a-b17-v1d firmware: upgrade to newer than 2.0.0; pgv150i-f200a-b17-v1d firmware: upgrade to newer than 2.0.0. Exact commands for each OS are on this page.

Is CVE-2021-20986 being exploited?

CVE-2021-20986 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-20986 affect?

CVE-2021-20986 affects profinet io device firmware, pgv100-f200a-b17-v1d firmware, pgv150i-f200a-b17-v1d firmware. Severity is high (CVSS 7.5). 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.

How urgent is CVE-2021-20986?

Priority 47/100. High severity; Remotely exploitable, no login, no user action

References

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