{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-22659 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-22659 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-22659 is a high-severity memory corruption vulnerability in Rockwell Automation MicroLogix 1400, published on 25 Mar 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-2021-22659 and fix it if it is affected.\n\nWhat it is: CVE-2021-22659 is a high-severity memory corruption vulnerability in Rockwell Automation MicroLogix 1400, published on 25 Mar 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-2021-22659 in the wild and no public exploit code.\n\nAffected product: Rockwell Automation MicroLogix 1400. 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-2021-22659/ (Markdown: https://insights.sbomify.com/CVE-2021-22659/index.md)","id":"CVE-2021-22659","markdown":"https://insights.sbomify.com/CVE-2021-22659/index.md","name":"CVE-2021-22659","record":{"aliases":["GHSA-fv9f-8rj8-45rf"],"analysis":{"component_type":"ics_ot","fix_type":"patch","impacts":["denial_of_service","data_read","data_modify"],"network_reachable":"yes","non_default_config":false,"product_category":"PLC","requires_auth":"none","summary":"Remote unauthenticated attackers can cause denial of service and read or modify register values via crafted Modbus packets in MicroLogix 1400 PLCs.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"icscert","cpe":[{"product":"micrologix_1400_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-120","name":"Buffer Copy without Checking Size of Input"}],"description":"Rockwell Automation MicroLogix 1400 Version 21.6 and below may allow a remote unauthenticated attacker to send a specially crafted Modbus packet allowing the attacker to retrieve or modify random values in the register. If successfully exploited, this may lead to a buffer overflow resulting in a denial-of-service condition. The FAULT LED will flash RED and communications may be lost. Recovery from denial-of-service condition requires the fault to be cleared by the user.","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":"Memory corruption in Rockwell Automation MicroLogix 1400","id":"CVE-2021-22659","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"memory_corruption","year":"2021"},"n_packages":0,"n_references":2,"next":{"headline":"Memory corruption in Delta Electronics CNCSoft-B","id":"CVE-2021-22660"},"packages":[],"prev":{"headline":"SQL injection in Advantech iView","id":"CVE-2021-22658"},"products":["Rockwell Automation MicroLogix 1400"],"published":"2021-03-25","related":[],"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 denial of service and read or modify register values via crafted Modbus packets in MicroLogix 1400 PLCs.","url":"https://insights.sbomify.com/CVE-2021-22659/"}