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CVE-2021-20988: In Hilscher rcX RTOS versions prios to V2.1.14.1 the actual UDP packet length is not verified against the leng

51
This month
HIGH 8.6REMOTEUPGRADEUPGRADEUPGRADE

CVE-2021-20988 is a high-severity flaw (CVSS 8.6) affecting rcx rtos, ice1-16di-g60l-v1d firmware, ice1-16dio-g60l-c1-v1d firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Hilscher rcX RTOS versions prios to V2.1.14.1 the actual UDP packet length is not verified against the length indicated by the packet. This may lead to a denial of service of the affected device.

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score8.6 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance1.0% (top 37%)
CISA exploited listNo
WeaknessCWE-119
Published2021-05-13
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 rcx rtos UPGRADE
Affected: < 2.1.14.1
Fixed in: 2.1.14.1
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy rcx-rtos || rpm -q rcx-rtos || rcx-rtos --version
2. UPGRADE to 2.1.14.1 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade rcx-rtos
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade rcx-rtos
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
pepperl-fuchs ice1-16di-g60l-v1d firmware UPGRADE
Affected: <= f10017
Fixed in: newer than f10017
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 ice1-16dio-g60l-c1-v1d firmware UPGRADE
Affected: <= f10017
Fixed in: newer than f10017
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 ice1-16dio-g60l-v1d firmware UPGRADE
Affected: <= f10017
Fixed in: newer than f10017
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 ice1-8di8do-g60l-c1-v1d firmware UPGRADE
Affected: <= f10017
Fixed in: newer than f10017
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 ice1-8di8do-g60l-v1d firmware UPGRADE
Affected: <= f10017
Fixed in: newer than f10017
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-2021-20988?

rcx rtos: upgrade to 2.1.14.1; ice1-16di-g60l-v1d firmware: upgrade to newer than f10017; ice1-16dio-g60l-c1-v1d firmware: upgrade to newer than f10017. Exact commands for each OS are on this page.

Is CVE-2021-20988 being exploited?

CVE-2021-20988 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-2021-20988 affect?

CVE-2021-20988 affects rcx rtos, ice1-16di-g60l-v1d firmware, ice1-16dio-g60l-c1-v1d firmware. Severity is high (CVSS 8.6). In Hilscher rcX RTOS versions prios to V2.1.14.1 the actual UDP packet length is not verified against the length indicated by the packet. This may lead to a denial of service of the affected device.

How urgent is CVE-2021-20988?

Priority 51/100. High severity; Remotely exploitable, no login, no user action

References

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