{"answers":{"affected":"It affects 2 products.","exploited":"There is no known exploitation of CVE-2020-12494 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2020-12494 yet. Limit exposure of the affected software until one is available.","what":"CVE-2020-12494 is a medium-severity vulnerability in Beckhoff TwinCat Driver for Intel 8254x (Tcl8254x.sys), published on 16 Jun 2020. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2020-12494 and fix it if it is affected.\n\nWhat it is: CVE-2020-12494 is a medium-severity vulnerability in Beckhoff TwinCat Driver for Intel 8254x (Tcl8254x.sys), published on 16 Jun 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2020-12494 in the wild and no public exploit code.\n\nAffected product: Beckhoff TwinCat Driver for Intel 8254x (Tcl8254x.sys). No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2020-12494/ (Markdown: https://insights.sbomify.com/CVE-2020-12494/index.md)","id":"CVE-2020-12494","markdown":"https://insights.sbomify.com/CVE-2020-12494/index.md","name":"CVE-2020-12494","record":{"aliases":["GHSA-92f3-r9r6-rrfr"],"analysis":{"component_type":"ics_ot","fix_type":"patch","impacts":["data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"Industrial network driver","requires_auth":"none","summary":"An attacker can read arbitrary memory contents from the network driver by sending small ICMP packets, potentially exposing sensitive data.","user_interaction":"not_required","vuln_class":"information_disclosure"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"CERTVDE","cpe":[{"product":"twincat","vendor":"beckhoff"},{"product":"twincat_driver","vendor":"beckhoff"}],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","version":"3.1"},"cwes":[{"id":"CWE-459","name":"Incomplete Cleanup"}],"description":"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.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Beckhoff: Etherleak in TwinCAT RT network driver","id":"CVE-2020-12494","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"information_disclosure","year":"2020"},"n_packages":0,"n_references":1,"next":{"headline":"ENDRESS+HAUSER: Ecograph T utilizing Webserver firmware version 1.x has improper privilege management","id":"CVE-2020-12495"},"packages":[],"prev":{"headline":"Critical Vulnerability in SWARCO CPU LS4000","id":"CVE-2020-12493"},"products":["TwinCat Driver for Intel 8254x (Tcl8254x.sys)","TwinCat Driver for Intel 8255x (Tcl8255x.sys)"],"published":"2020-06-16","related":[{"cvss_score":9.8,"headline":"Auth bypass in n/a","id":"CVE-2019-16871","kev_date_added":null,"published":"2019-12-19"},{"cvss_score":9.1,"headline":"Weak cryptography in Beckhoff TwinCAT","id":"CVE-2017-16726","kev_date_added":null,"published":"2018-06-27"},{"cvss_score":7.8,"headline":"Privilege escalation in Beckhoff TwinCAT PLC products","id":"CVE-2018-7502","kev_date_added":null,"published":"2018-03-23"},{"cvss_score":7.5,"headline":"Beckhoff TwinCAT Profinet Driver Divide-by-Zero Denial of Service","id":"CVE-2019-5637","kev_date_added":null,"published":"2019-11-21"},{"cvss_score":5.9,"headline":"Weak cryptography in Beckhoff TwinCAT","id":"CVE-2017-16718","kev_date_added":null,"published":"2018-06-27"},{"cvss_score":5.3,"headline":"Beckhoff TwinCAT Discovery Service Denial of Service","id":"CVE-2019-5636","kev_date_added":null,"published":"2019-11-21"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-04","vendors":["Beckhoff"]},"summary":"An attacker can read arbitrary memory contents from the network driver by sending small ICMP packets, potentially exposing sensitive data.","url":"https://insights.sbomify.com/CVE-2020-12494/"}