CVE-2021-20988 - CVE House
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Status published High CVE-2021-20988

Hilscher rcX RTOS: Wrong handling of the UDP checksum

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

More from Hilscher

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CVE-2021-20987
Hilscher: EtherNet/IP stack crash for specific CIP service
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CVE-2021-20986
Hilscher: Denial of Service vulnerability in PROFINET IO Device
High 7.5

Affected Vendor

Affected Software

rcX RTOS, Ethernet IO Modules ICE1-16, Ethernet IO Modules ICE1-8
Vulnerable Versions:
unspecified, ICE1-16DI-G60L-V1D, ICE1-16DIO-G60L-C1-V1D, ICE1-16DIO-G60L-V1D, ICE1-8DI8DO-G60L-C1-V1D, ICE1-8DI8DO-G60L-V1D, ICE1-8IOL-G30L-V1D, ICE1-8IOL-G60L-V1D, ICE1-8IOL-S2-G60L-V1D

Timeline

Official Publish: May 13th, 2021
Last Modified: September 16th, 2024
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Weaknesses (CWE)

CWE-119

MITRE ATT&CK TTPs

T1068 Exploitation for Privilege Escalation
Privilege Escalation
T1203 Exploitation for Client Execution
Execution
T1055 Process Injection
Defense Evasion
T1105 Ingress Tool Transfer
Command and Control