Vulnerability in Beckhoff Twincat
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 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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.010 (61.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 61.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000
Affected products
- Beckhoff Twincat — versions 3.1, 2.11
- Beckhoff Twincat Driver
- Beckhoff Twincat Driver For Intel 8254x (Tcl8254x.sys) — versions unspecified
- Beckhoff Twincat Driver For Intel 8255x (Tcl8255x.sys) — versions unspecified
- Intel 82540em
- Intel 82540ep
- Intel 82541ei
- Intel 82541er
- Intel 82541gi
- Intel 82541pi
Weakness classification (CWE)
References
- cert.vde.com/en-us/advisories/vde-2020-019 (Third Party Advisory)
Frequently asked questions
- What is CVE-2020-12494?
- CVE-2020-12494 is a medium-severity vulnerability in Beckhoff Twincat, classified under Incomplete Cleanup. CVSS score: 5.3/10. Published 2020-06-16.
- How severe is CVE-2020-12494?
- Medium severity. CVSS v3 base score is 5.3 out of 10.