{"id":"CVE-2021-22787","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-22787","generatedAt":"2026-10-28T05:26:43.293Z","title":"A CWE-20: Improper Input Validation vulnerability exists that could cause denial of service of the device when an attacker sends a specially crafted HTTP request to the web server of the device.","description":"A CWE-20: Improper Input Validation vulnerability exists that could cause denial of service of the device when an attacker sends a specially crafted HTTP request to the web server of the device. Affected Product: Modicon M340 CPUs: BMXP34 (Versions prior to V3.40), Modicon M340 X80 Ethernet Communication Modules: BMXNOE0100 (H), BMXNOE0110 (H), BMXNOC0401, BMXNOR0200H RTU (All Versions), Modicon Premium Processors with integrated Ethernet (Copro): TSXP574634, TSXP575634, TSXP576634 (All Versions), Modicon Quantum Processors with Integrated Ethernet (Copro): 140CPU65xxxxx (All Versions), Modicon Quantum Communication Modules: 140NOE771x1, 140NOC78x00, 140NOC77101 (All Versions), Modicon Premium Communication Modules: TSXETY4103, TSXETY5103 (All Versions)","published":"2022-02-11T18:15:09.000Z","lastModified":"2026-06-17T03:37:47.000Z","status":"Modified","sourceIdentifier":"cybersecurity@se.com","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-20"],"affected":["schneider-electric/modicon m340 bmxp342020 firmware","schneider-electric/bmxnoe0100 firmware","schneider-electric/bmxnoe0110 firmware","schneider-electric/bmxnoc0401 firmware","schneider-electric/bmxnor0200h rtu firmware","schneider-electric/tsxp574634 firmware","schneider-electric/tsxp575634 firmware","schneider-electric/tsxp576634 firmware","schneider-electric/140cpu65150 firmware","schneider-electric/140noe771x1 firmware","schneider-electric/140noc78x00 firmware","schneider-electric/140noc77101 firmware","schneider-electric/tsxety4103 firmware","schneider-electric/tsxety5103 firmware"],"epss":{"score":0.01066,"percentile":0.64579,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (1.07%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-257-02","tags":["Patch","Vendor Advisory"],"source":"cybersecurity@se.com"},{"url":"https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-257-02","tags":["Patch","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-22787","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}