{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-33012 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-33012 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-33012 is a high-severity denial of service vulnerability in Rockwell Automation MicroLogix 1100, published on 9 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-33012 and fix it if it is affected.\n\nWhat it is: CVE-2021-33012 is a high-severity denial of service vulnerability in Rockwell Automation MicroLogix 1100, published on 9 Jul 2021. 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-2021-33012 in the wild and no public exploit code.\n\nAffected product: Rockwell Automation MicroLogix 1100. 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-2021-33012/ (Markdown: https://insights.sbomify.com/CVE-2021-33012/index.md)","id":"CVE-2021-33012","markdown":"https://insights.sbomify.com/CVE-2021-33012/index.md","name":"CVE-2021-33012","record":{"aliases":["GHSA-m5fq-q49w-wc2j"],"analysis":{"component_type":"ics_ot","fix_type":"no_fix_stated","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"PLC controller","requires_auth":"none","summary":"Remote unauthenticated attackers can cause Rockwell MicroLogix 1100 PLCs to fault upon entering RUN mode, resulting in a denial-of-service condition.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"icscert","cpe":[{"product":"micrologix_1100_firmware","vendor":"rockwellautomation"}],"cvss":{"score":7.5,"severity":"high","source":"cisa-adp","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-20","name":"Improper Input Validation"}],"description":"Rockwell Automation MicroLogix 1100, all versions, allows a remote, unauthenticated attacker sending specially crafted commands to cause the PLC to fault when the controller is switched to RUN mode, which results in a denial-of-service condition. If successfully exploited, this vulnerability will cause the controller to fault whenever the controller is switched to RUN mode.","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":"Denial of service in Rockwell Automation MicroLogix 1100","id":"CVE-2021-33012","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2021"},"n_packages":0,"n_references":1,"next":{"headline":"mySCADA myPRO Improper Access Control","id":"CVE-2021-33013"},"packages":[],"prev":{"headline":"Denial of service in JTEKT Corporation TOYOPUC products","id":"CVE-2021-33011"},"products":["Rockwell Automation MicroLogix 1100"],"published":"2021-07-09","related":[{"cvss_score":9.8,"headline":"Weak cryptography in Rockwell Automation MicroLogix 1400 Controllers Series B v21.001 and prior, Series A, all versions, MicroLogix 1100 Controller, all versions, RSLogix 500 Software v12.001 and prior","id":"CVE-2020-6984","kev_date_added":null,"published":"2020-03-16"},{"cvss_score":9.8,"headline":"Hardcoded credentials in Rockwell Automation MicroLogix 1400 Controllers Series B v21.001 and prior, Series A, all versions, MicroLogix 1100 Controller, all versions, RSLogix 500 Software v12.001 and prior","id":"CVE-2020-6990","kev_date_added":null,"published":"2020-03-16"},{"cvss_score":9.8,"headline":"Memory corruption in n/a","id":"CVE-2015-6490","kev_date_added":null,"published":"2015-10-28"},{"cvss_score":7.5,"headline":"MicroLogix 1100 \u0026 1400 Product Web Server Application Vulnerable to Denial-Of-Service Condition Attack","id":"CVE-2022-3166","kev_date_added":null,"published":"2022-12-16"},{"cvss_score":7.5,"headline":"Information disclosure in Rockwell Automation MicroLogix 1400 Controllers Series B v21.001 and prior, Series A, all versions, MicroLogix 1100 Controller, all versions, RSLogix 500 Software v12.001 and prior","id":"CVE-2020-6988","kev_date_added":null,"published":"2020-03-16"},{"cvss_score":7.5,"headline":"Memory corruption in n/a","id":"CVE-2015-6492","kev_date_added":null,"published":"2015-10-28"}],"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":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-06-03","vendors":["n/a"]},"summary":"Remote unauthenticated attackers can cause Rockwell MicroLogix 1100 PLCs to fault upon entering RUN mode, resulting in a denial-of-service condition.","url":"https://insights.sbomify.com/CVE-2021-33012/"}