{"id":"CVE-2021-30186","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-30186","generatedAt":"2026-10-28T04:17:25.807Z","title":"CODESYS V2 runtime system SP before 2.4.7.55 has a Heap-based Buffer Overflow.","description":"CODESYS V2 runtime system SP before 2.4.7.55 has a Heap-based Buffer Overflow.","published":"2021-05-25T13:15:18.000Z","lastModified":"2026-06-17T03:49:50.000Z","status":"Analyzed","sourceIdentifier":"cve@mitre.org","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-787"],"affected":["wago/750-893 firmware","wago/750-891 firmware","wago/750-890 firmware","wago/750-889 firmware","wago/750-885 firmware","wago/750-882 firmware","wago/750-881 firmware","wago/750-880 firmware","wago/750-862 firmware","wago/750-852 firmware","wago/750-832 firmware","wago/750-831 firmware","wago/750-829 firmware","wago/750-8202 firmware","wago/750-8203 firmware","wago/750-8204 firmware","wago/750-8206 firmware","wago/750-8207 firmware","wago/750-8208 firmware","wago/750-8210 firmware","wago/750-8211 firmware","wago/750-8212 firmware","wago/750-8213 firmware","wago/750-8214 firmware","wago/750-8216 firmware","wago/750-8217 firmware","codesys/plcwinnt","codesys/runtime toolkit","wago/750-823 firmware"],"epss":{"score":0.07737,"percentile":0.94597,"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 (7.74%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://customers.codesys.com/index.php","tags":["Permissions Required","Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=14725&token=08691519ef764b252630759eff925890176ecd78&download=","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://customers.codesys.com/index.php","tags":["Permissions Required","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=14725&token=08691519ef764b252630759eff925890176ecd78&download=","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-30186","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."}