{"answers":{"affected":"It affects 20 products.","exploited":"There is no known exploitation of CVE-2021-20591 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-20591 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-20591 is a high-severity denial of service vulnerability in MELSEC iQ-R series CPU modules, published on 11 Jun 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-2021-20591 and fix it if it is affected.\n\nWhat it is: CVE-2021-20591 is a high-severity denial of service vulnerability in MELSEC iQ-R series CPU modules, published on 11 Jun 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-2021-20591 in the wild and no public exploit code.\n\nAffected product: MELSEC iQ-R series CPU modules. 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-2021-20591/ (Markdown: https://insights.sbomify.com/CVE-2021-20591/index.md)","id":"CVE-2021-20591","markdown":"https://insights.sbomify.com/CVE-2021-20591/index.md","name":"CVE-2021-20591","record":{"aliases":["GHSA-mhpv-hfp2-2648"],"analysis":{"component_type":"ics_ot","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Mitsubishi PLC CPU","requires_auth":"none","summary":"Remote unauthenticated attackers can cause denial of service on Mitsubishi MELSEC iQ-R CPU modules by exhausting connection resources.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Mitsubishi","cpe":[{"product":"r00cpu_firmware","vendor":"mitsubishielectric"},{"product":"r01cpu_firmware","vendor":"mitsubishielectric"},{"product":"r02cpu_firmware","vendor":"mitsubishielectric"},{"product":"r04cpu_firmware","vendor":"mitsubishielectric"},{"product":"r08cpu_firmware","vendor":"mitsubishielectric"},{"product":"r08pcpu_firmware","vendor":"mitsubishielectric"},{"product":"r08psfcpu_firmware","vendor":"mitsubishielectric"},{"product":"r08sfcpu_firmware","vendor":"mitsubishielectric"},{"product":"r120cpu_firmware","vendor":"mitsubishielectric"},{"product":"r120pcpu_firmware","vendor":"mitsubishielectric"},{"product":"r120psfcpu_firmware","vendor":"mitsubishielectric"},{"product":"r120sfcpu_firmware","vendor":"mitsubishielectric"},{"product":"r16cpu_firmware","vendor":"mitsubishielectric"},{"product":"r16pcpu_firmware","vendor":"mitsubishielectric"},{"product":"r16psfcpu_firmware","vendor":"mitsubishielectric"},{"product":"r16sfcpu_firmware","vendor":"mitsubishielectric"},{"product":"r32cpu_firmware","vendor":"mitsubishielectric"},{"product":"r32pcpu_firmware","vendor":"mitsubishielectric"},{"product":"r32psfcpu_firmware","vendor":"mitsubishielectric"},{"product":"r32sfcpu_firmware","vendor":"mitsubishielectric"}],"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-400","name":"Uncontrolled Resource Consumption"}],"description":"Uncontrolled Resource Consumption vulnerability in Mitsubishi Electric MELSEC iQ-R series CPU modules (R00/01/02CPU all versions, R04/08/16/32/120(EN)CPU all versions, R08/16/32/120SFCPU all versions, R08/16/32/120PCPU all versions, R08/16/32/120PSFCPU all versions) allows a remote unauthenticated attacker to prevent legitimate clients from connecting to the MELSOFT transmission port (TCP/IP) by not closing a connection properly, which may lead to a denial of service (DoS) condition.","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 MELSEC iQ-R series CPU modules","id":"CVE-2021-20591","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2021"},"n_packages":0,"n_references":2,"next":{"headline":"Race condition in GOT2000 series GT27 model; GT25 model; GT23 model; GT SoftGOT2000","id":"CVE-2021-20592"},"packages":[],"prev":{"headline":"Auth bypass in GOT SIMPLE series GS21 model GS2107-WTBD-N","id":"CVE-2021-20590"},"products":["MELSEC iQ-R series CPU modules"],"published":"2021-06-11","related":[{"cvss_score":7.5,"headline":"Denial of service in n/a","id":"CVE-2020-16850","kev_date_added":null,"published":"2020-11-30"},{"cvss_score":7.5,"headline":"Denial of service in MELSEC iQ-R","id":"CVE-2020-5668","kev_date_added":null,"published":"2020-11-20"}],"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":"Remote unauthenticated attackers can cause denial of service on Mitsubishi MELSEC iQ-R CPU modules by exhausting connection resources.","url":"https://insights.sbomify.com/CVE-2021-20591/"}