CVE-2021-20988

Name: CVE-2021-20988
Creator: NVD / NIST
Published: 2021-05-13T14:15:17.897+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.99%

Last modified Jun 17, 2026

CVE-2021-20988 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 0.99% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.99%

58.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Hilscher	Rcx Rtos	< 2.1.14.1
Pepperl-Fuchs	Ice1-16di-G60l-V1d Firmware	<= f10017
Pepperl-Fuchs	Ice1-16dio-G60l-C1-V1d Firmware	<= f10017
Pepperl-Fuchs	Ice1-16dio-G60l-V1d Firmware	<= f10017
Pepperl-Fuchs	Ice1-8di8do-G60l-C1-V1d Firmware	<= f10017
Pepperl-Fuchs	Ice1-8di8do-G60l-V1d Firmware	<= f10017
Pepperl-Fuchs	Ice1-8iol-G30l-V1d Firmware	<= f10017
Pepperl-Fuchs	Ice1-8iol-G60l-V1d Firmware	<= f10017
Pepperl-Fuchs	Ice1-8iol-S2-G60l-V1d Firmware	<= f10017

References

https://cert.vde.com/de-de/advisories/vde-2021-018Third Party Advisory
https://kb.hilscher.com/display/ISMS/2019-04-10+Wrong+handling+of+the+UDP+checksumVendor Advisory
https://cert.vde.com/de-de/advisories/vde-2021-018Third Party Advisory
https://kb.hilscher.com/display/ISMS/2019-04-10+Wrong+handling+of+the+UDP+checksumVendor Advisory

Timeline

Published: May 13, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20988?

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 severe is CVE-2021-20988?

CVE-2021-20988 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.99% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20988?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-20988?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST