{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-9621 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-9621 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-9621 is a critical denial of service vulnerability in Rockwell Automation RSLinx Classic®, published on 1 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-9621 and fix it if it is affected.\n\nWhat it is: CVE-2026-9621 is a critical denial of service vulnerability in Rockwell Automation RSLinx Classic®, published on 1 Sep 2026. 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-2026-9621 in the wild and no public exploit code.\n\nAffected product: Rockwell Automation RSLinx Classic®. 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-2026-9621/ (Markdown: https://insights.sbomify.com/CVE-2026-9621/index.md)","id":"CVE-2026-9621","markdown":"https://insights.sbomify.com/CVE-2026-9621/index.md","name":"CVE-2026-9621","record":{"aliases":["GHSA-x222-px97-5m97"],"analysis":{"component_type":"ics_ot","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Industrial connectivity software","requires_auth":"none","summary":"A crafted CIP packet causes RSLinx Classic to crash, requiring a service restart to recover.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Rockwell","cpe":[],"cvss":{"score":9.2,"severity":"critical","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H","version":"4.0"},"cwes":[{"id":"CWE-190","name":"Integer Overflow or Wraparound"}],"description":"A denial-of-service security issue exists within RSLinx® Classic. The security issue stems from improper handling of a malformed packet. A crafted CIP packet can cause the RSLinx® Classic service to crash, requiring a restart of the service to recover","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":"RSLinx Classic® - Multiple Vulnerabilities","id":"CVE-2026-9621","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"RSLinx Classic® - Multiple Vulnerabilities","id":"CVE-2026-9622"},"packages":[],"prev":{"headline":"WP Latest Posts \u003c= 5.0.11 - Authenticated (Author+) Stored Cross-Site Scripting via Post Content Image src Attribute","id":"CVE-2026-9620"},"products":["RSLinx Classic®"],"published":"2026-09-01","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"2026-09-01","vendors":["Rockwell Automation"]},"summary":"A crafted CIP packet causes RSLinx Classic to crash, requiring a service restart to recover.","url":"https://insights.sbomify.com/CVE-2026-9621/"}