{"answers":{"affected":"It affects 5 products.","exploited":"There is no known exploitation of CVE-2020-5656 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2020-5656 yet. Limit exposure of the affected software until one is available.","what":"CVE-2020-5656 is a critical missing authorization vulnerability in Mitsubishi Electric Corporation MELSEC iQ-R series, published on 30 Oct 2020. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2020-5656 and fix it if it is affected.\n\nWhat it is: CVE-2020-5656 is a critical missing authorization vulnerability in Mitsubishi Electric Corporation MELSEC iQ-R series, published on 30 Oct 2020. 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-2020-5656 in the wild and no public exploit code.\n\nAffected product: Mitsubishi Electric Corporation MELSEC iQ-R series. 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-2020-5656/ (Markdown: https://insights.sbomify.com/CVE-2020-5656/index.md)","id":"CVE-2020-5656","markdown":"https://insights.sbomify.com/CVE-2020-5656/index.md","name":"CVE-2020-5656","record":{"aliases":["GHSA-f9w6-p56j-vxgh"],"analysis":{"component_type":"ics_ot","fix_type":"patch","impacts":["code_execution","denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Mitsubishi PLC module","requires_auth":"none","summary":"Remote unauthenticated attackers can execute malicious code or cause denial of service on Mitsubishi MELSEC iQ-R network modules via crafted packets.","user_interaction":"not_required","vuln_class":"missing_authorization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"jpcert","cpe":[{"product":"melsec_iq-rd81dl96_firmware","vendor":"mitsubishielectric"},{"product":"melsec_iq-rd81mes96n_firmware","vendor":"mitsubishielectric"},{"product":"melsec_iq-rd81opc96_firmware","vendor":"mitsubishielectric"},{"product":"melsec_iq-rj71eip91_firmware","vendor":"mitsubishielectric"},{"product":"melsec_iq-rj71pn92_firmware","vendor":"mitsubishielectric"}],"cvss":{"score":9.8,"severity":"critical","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[],"description":"Improper access control vulnerability in TCP/IP function included in the firmware of MELSEC iQ-R series (RJ71EIP91 EtherNet/IP Network Interface Module First 2 digits of serial number are '02' or before, RJ71PN92 PROFINET IO Controller Module First 2 digits of serial number are '01' or before, RD81DL96 High Speed Data Logger Module First 2 digits of serial number are '08' or before, RD81MES96N MES Interface Module First 2 digits of serial number are '04' or before, and RD81OPC96 OPC UA Server Module First 2 digits of serial number are '04' or before) allows a remote unauthenticated attacker to stop the network functions of the products or execute a malicious program via a specially crafted packet.","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":"Missing authorization in MELSEC iQ-R series","id":"CVE-2020-5656","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"missing_authorization","year":"2020"},"n_packages":0,"n_references":3,"next":{"headline":"Command injection in MELSEC iQ-R series","id":"CVE-2020-5657"},"packages":[],"prev":{"headline":"Null dereference in MELSEC iQ-R series","id":"CVE-2020-5655"},"products":["MELSEC iQ-R series"],"published":"2020-10-30","related":[{"cvss_score":9.8,"headline":"Memory corruption in MELSEC iQ-R series","id":"CVE-2020-5653","kev_date_added":null,"published":"2020-10-30"},{"cvss_score":7.5,"headline":"Auth bypass in MELSEC iQ-R series","id":"CVE-2020-5654","kev_date_added":null,"published":"2020-10-30"},{"cvss_score":7.5,"headline":"Null dereference in MELSEC iQ-R series","id":"CVE-2020-5655","kev_date_added":null,"published":"2020-10-30"},{"cvss_score":7.5,"headline":"Denial of service in MELSEC iQ-R series","id":"CVE-2020-5658","kev_date_added":null,"published":"2020-10-30"},{"cvss_score":6.5,"headline":"Command injection in MELSEC iQ-R series","id":"CVE-2020-5657","kev_date_added":null,"published":"2020-10-30"}],"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":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-04","vendors":["Mitsubishi Electric Corporation"]},"summary":"Remote unauthenticated attackers can execute malicious code or cause denial of service on Mitsubishi MELSEC iQ-R network modules via crafted packets.","url":"https://insights.sbomify.com/CVE-2020-5656/"}