HOMEVULNERABILITIESCVE-2021-20988
HIGH

CVE-2021-20988

CWE-119Published: May 13, 2021· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-20988 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

From a weakness classification perspective (CWE-119): Buffer overflow vulnerabilities can lead to arbitrary code execution or denial of service by corrupting adjacent memory.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

hilscher1 product(s)
rcx rtos
pepperl-fuchs16 product(s)
ice1-16di-g60l-v1d firmwareice1-16di-g60l-v1dice1-16dio-g60l-c1-v1d firmwareice1-16dio-g60l-c1-v1dice1-16dio-g60l-v1d firmwareice1-16dio-g60l-v1dice1-8di8do-g60l-c1-v1d firmwareice1-8di8do-g60l-c1-v1dice1-8di8do-g60l-v1d firmwareice1-8di8do-g60l-v1dice1-8iol-g30l-v1d firmwareice1-8iol-g30l-v1d+4
Source: NVD CPE · 17 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

All References (4)

Quick Facts

CVE IDCVE-2021-20988
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-119
CISA KEVNo
Affected2 vendor(s)
PublishedMay 13, 2021

Related CVEs (CWE-119)

Recommended Actions

  • Apply vendor patches immediately
  • Monitor CVE-2021-20988 in threat intel feeds
  • Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.