{"answers":{"affected":"It affects 3 products.","exploited":"There is no known exploitation of CVE-2021-20596 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-20596 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-20596 is a high-severity vulnerability in MELSEC-F Series FX3U-ENET; FX3U-ENET-L; FX3U-ENET-P502, published on 22 Jul 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-2021-20596 and fix it if it is affected.\n\nWhat it is: CVE-2021-20596 is a high-severity vulnerability in MELSEC-F Series FX3U-ENET; FX3U-ENET-L; FX3U-ENET-P502, published on 22 Jul 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-2021-20596 in the wild and no public exploit code.\n\nAffected product: MELSEC-F Series FX3U-ENET; FX3U-ENET-L; FX3U-ENET-P502. 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-2021-20596/ (Markdown: https://insights.sbomify.com/CVE-2021-20596/index.md)","id":"CVE-2021-20596","markdown":"https://insights.sbomify.com/CVE-2021-20596/index.md","name":"CVE-2021-20596","record":{"aliases":["GHSA-wrr3-chw5-r88x"],"analysis":{"component_type":"ics_ot","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Mitsubishi PLC module","requires_auth":"none","summary":"Remote unauthenticated attackers can cause a denial of service in Mitsubishi MELSEC-F series PLC communication modules by sending specially crafted packets.","user_interaction":"not_required","vuln_class":"null_dereference"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Mitsubishi","cpe":[{"product":"fx3u-enet-l_firmware","vendor":"mitsubishielectric"},{"product":"fx3u-enet-p502_firmware","vendor":"mitsubishielectric"},{"product":"fx3u-enet_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-476","name":"NULL Pointer Dereference"}],"description":"NULL Pointer Dereference in MELSEC-F Series FX3U-ENET firmware version 1.14 and prior, FX3U-ENET-L firmware version 1.14 and prior and FX3U-ENET-P502 firmware version 1.14 and prior allows a remote unauthenticated attacker to cause a DoS condition in communication by sending specially crafted packets. Control by MELSEC-F series PLC is not affected and system reset is required for recovery.","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":"Null dereference in MELSEC-F Series FX3U-ENET; FX3U-ENET-L; FX3U-ENET-P502","id":"CVE-2021-20596","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"null_dereference","year":"2021"},"n_packages":0,"n_references":3,"next":{"headline":"Information disclosure in Mitsubishi Electric MELSEC iQ-R series Safety CPU modules R08/16/32/120SFCPU; Mitsubishi Electric MELSEC iQ-R series SIL2 Process CPU modules R08/16/32/120PSFCPU","id":"CVE-2021-20597"},"packages":[],"prev":{"headline":"XML external entity in Air Conditioning System/Centralized Controllers G-50A; GB-50A; GB-24A; AG-150A-A; AG-150A-J; GB-50ADA-A; GB-50ADA-J; EB-50GU-A; EB-50GU-J; AE-200A; AE-200E; AE-50A; AE-50E; EW-50A; EW-50E; TE-200A; TE-50A; TW-50A; CMS-RMD-J; Air Conditioning System/Expansion Controllers PAC-YG50ECA; Air Conditioning System/BM adapter BAC-HD150","id":"CVE-2021-20595"},"products":["MELSEC-F Series FX3U-ENET; FX3U-ENET-L; FX3U-ENET-P502"],"published":"2021-07-22","related":[{"cvss_score":7.5,"headline":"Denial of service in MELSEC-F series FX3U-ENET; MELSEC-F series FX3U-ENET-L; MELSEC-F series FX3U-ENET-P502","id":"CVE-2021-20612","kev_date_added":null,"published":"2022-01-14"},{"cvss_score":7.5,"headline":"Denial of service in MELSEC-F series FX3U-ENET; MELSEC-F series FX3U-ENET-L; MELSEC-F series FX3U-ENET-P502","id":"CVE-2021-20613","kev_date_added":null,"published":"2022-01-14"}],"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 a denial of service in Mitsubishi MELSEC-F series PLC communication modules by sending specially crafted packets.","url":"https://insights.sbomify.com/CVE-2021-20596/"}