{"answers":{"affected":"It affects 2 products.","exploited":"There is no known exploitation of CVE-2021-22699 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-22699 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-22699 is a high-severity denial of service vulnerability in Modicon M241/M251 logic controllers firmware prior to V5.1.9.1, published on 26 May 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-2021-22699 and fix it if it is affected.\n\nWhat it is: CVE-2021-22699 is a high-severity denial of service vulnerability in Modicon M241/M251 logic controllers firmware prior to V5.1.9.1, published on 26 May 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-2021-22699 in the wild and no public exploit code.\n\nAffected product: Modicon M241/M251 logic controllers firmware prior to V5.1.9.1. 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-2021-22699/ (Markdown: https://insights.sbomify.com/CVE-2021-22699/index.md)","id":"CVE-2021-22699","markdown":"https://insights.sbomify.com/CVE-2021-22699/index.md","name":"CVE-2021-22699","record":{"aliases":["GHSA-6vx6-7ghj-3776"],"analysis":{"component_type":"ics_ot","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Modicon logic controllers","requires_auth":"none","summary":"Attackers can cause denial of service on Modicon M241/M251 logic controllers by sending crafted HTTP requests, impacting industrial control operations.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"schneider","cpe":[{"product":"modicon_m241_firmware","vendor":"schneider-electric"},{"product":"modicon_m251_firmware","vendor":"schneider-electric"}],"cvss":{"score":7.5,"severity":"high","source":"nvd","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":"Improper Input Validation vulnerability exists in Modicon M241/M251 logic controllers firmware prior to V5.1.9.1 that could cause denial of service when specific crafted requests are sent to the controller over HTTP.","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 Modicon M241/M251 logic controllers firmware prior to V5.1.9.1","id":"CVE-2021-22699","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":"Cross-site request forgery in PowerLogic ION7400, ION7650, ION83xx/84xx/85xx/8600, ION8650, ION8800, ION9000 and PM800 (see notification for affected versions)","id":"CVE-2021-22701"},"packages":[],"prev":{"headline":"File upload in EcoStruxure Power Build - Rapsody software V2.1.13 and prior.","id":"CVE-2021-22698"},"products":["Modicon M241/M251 logic controllers firmware prior to V5.1.9.1"],"published":"2021-05-26","related":[{"cvss_score":9.8,"headline":"Hardcoded credentials in Schneider Electric Modicon PLCs","id":"CVE-2017-6028","kev_date_added":null,"published":"2017-06-30"},{"cvss_score":9.1,"headline":"Weak cryptography in Schneider Electric Modicon PLCs","id":"CVE-2017-6026","kev_date_added":null,"published":"2017-06-30"},{"cvss_score":6.9,"headline":"Denial of service in Modicon M241/M251","id":"CVE-2025-13901","kev_date_added":null,"published":"2026-03-10"}],"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":"2024-08-03","vendors":["n/a"]},"summary":"Attackers can cause denial of service on Modicon M241/M251 logic controllers by sending crafted HTTP requests, impacting industrial control operations.","url":"https://insights.sbomify.com/CVE-2021-22699/"}