CVE-2020-12494: Beckhoff's TwinCAT RT network driver for Intel 8254x and 8255x is providing EtherCAT functionality. The driver implements real-time features. Except for…

PriorityP429medium5.3CVSS 3.1

AVNACLPRNUINSUCLINAN

EPSS

1.01%

58.9th percentile

Beckhoff's TwinCAT RT network driver for Intel 8254x and 8255x is providing EtherCAT functionality. The driver implements real-time features. Except for Ethernet frames sent from real-time functionality, all other Ethernet frames sent through the driver are not padded if their payload is less than the minimum Ethernet frame size. Instead, arbitrary memory content is transmitted within in the padding bytes of the frame. Most likely this memory contains slices from previously transmitted or received frames. By this method, memory content is disclosed, however, an attacker can hardly control which memory content is affected. For example, the disclosure can be provoked with small sized ICMP echo requests sent to the device.

Affected

8 ranges

Vendor	Product	Version range	Fixed in
beckhoff	twincat	<= 3.1.0.3512	—
beckhoff	twincat	<= 2.11.0.2120	—
beckhoff	twincat	<= 3.1.0.3600	—
beckhoff	twincat	<= 3.1.0.3500	—
beckhoff	twincat	<= 2.11.0.2117	—
beckhoff	twincat_driver	<= 3.1.0.3603	—
beckhoff	twincat_driver_for_intel_8254x	unspecified – 3.1.0.3603 for TwinCAT 3.1 4024	—
beckhoff	twincat_driver_for_intel_8255x	unspecified – 3.1.0.3600 for TwinCAT 3.1 4024	—

CVSS provenance

nvdv3.15.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

nvdv2.05.0MEDIUMAV:N/AC:L/Au:N/C:P/I:N/A:N

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.