{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2019-5636 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2019-5636 yet. Limit exposure of the affected software until one is available.","what":"CVE-2019-5636 is a medium-severity denial of service vulnerability in Beckhoff TwinCAT 2, published on 21 Nov 2019. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2019-5636 and fix it if it is affected.\n\nWhat it is: CVE-2019-5636 is a medium-severity denial of service vulnerability in Beckhoff TwinCAT 2, published on 21 Nov 2019. 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-2019-5636 in the wild and no public exploit code.\n\nAffected product: Beckhoff TwinCAT 2. 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-2019-5636/ (Markdown: https://insights.sbomify.com/CVE-2019-5636/index.md)","id":"CVE-2019-5636","markdown":"https://insights.sbomify.com/CVE-2019-5636/index.md","name":"CVE-2019-5636","record":{"aliases":["GHSA-pv38-9q3c-3qq8"],"analysis":{"component_type":"ics_ot","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Industrial Automation Software","requires_auth":"none","summary":"A malformed UDP packet causes the ADS Discovery Service to shut down in Beckhoff TwinCAT Runtime, disrupting discovery services without stopping device operations.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"rapid7","cpe":[{"product":"twincat","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:N/I:N/A:L","version":"3.1"},"cwes":[{"id":"CWE-404","name":"Improper Resource Shutdown or Release"}],"description":"When a Beckhoff TwinCAT Runtime receives a malformed UDP packet, the ADS Discovery Service shuts down. Note that the TwinCAT devices are still performing as normal. This issue affects TwinCAT 2 version 2304 (and prior) and TwinCAT 3.1 version 4204.0 (and prior).","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 TwinCAT Discovery Service Denial of Service","id":"CVE-2019-5636","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2019"},"n_packages":0,"n_references":2,"next":{"headline":"Beckhoff TwinCAT Profinet Driver Divide-by-Zero Denial of Service","id":"CVE-2019-5637"},"packages":[],"prev":{"headline":"Hickory Smart Lock Cleartext Password","id":"CVE-2019-5635"},"products":["TwinCAT 2","TwinCAT 3.1"],"published":"2019-11-21","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: Etherleak in TwinCAT RT network driver","id":"CVE-2020-12494","kev_date_added":null,"published":"2020-06-16"}],"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":"2024-09-17","vendors":["Beckhoff"]},"summary":"A malformed UDP packet causes the ADS Discovery Service to shut down in Beckhoff TwinCAT Runtime, disrupting discovery services without stopping device operations.","url":"https://insights.sbomify.com/CVE-2019-5636/"}