CVE-2021-20988
Hilscher rcX RTOS: Wrong handling of the UDP checksum
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Hilscher rcX RTOS: Wrong handling of the UDP checksum
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.
- Record
CVE-2021-20988- CVSS 3.1
- 8.6 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H - Weakness
- CWE-119
- Updated
- 2026-11-02
EUVDEUVD-2021-8397
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.
- Record
EUVD-2021-8397- CVSS 3.1
- 8.6 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-473m-ppf7-95wq No score
In Hilscher rcX RTOS versions prios to V2.1.14.1 the actual UDP packet length is not verified...
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.
- Record
GHSA-473m-ppf7-95wq- Weakness
- CWE-119
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2021-20988- CVSS 3.1
- 8.6 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Weakness
- CWE-119
- Updated
- 2026-11-02
Affected products
- hilscher rcx rtos
- pepperl+fuchs ethernet io modules ice1-16
- pepperl+fuchs ethernet io modules ice1-8
- pepperl-fuchs ice1-16di-g60l-v1d firmware
- pepperl-fuchs ice1-16dio-g60l-c1-v1d firmware
- pepperl-fuchs ice1-16dio-g60l-v1d firmware
- pepperl-fuchs ice1-8di8do-g60l-c1-v1d firmware
- pepperl-fuchs ice1-8di8do-g60l-v1d firmware
- pepperl-fuchs ice1-8iol-g30l-v1d firmware
- pepperl-fuchs ice1-8iol-g60l-v1d firmware
- pepperl-fuchs ice1-8iol-s2-g60l-v1d firmware
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-20988 is a high vulnerability (CVSS 8.6) in Hilscher Rcx Rtos, published May 13, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.99%, the 62nd percentile. No source names a fixed version.