{"id":"CVE-2021-34585","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-34585","generatedAt":"2026-10-27T21:09:20.030Z","title":"This leads to a denial of service situation.","description":"In the CODESYS V2 web server prior to V1.1.9.22 crafted web server requests can trigger a parser error. Since the parser result is not checked under all conditions, a pointer dereference with an invalid address can occur. This leads to a denial of service situation.","published":"2021-10-26T10:15:08.000Z","lastModified":"2026-06-17T03:56:11.000Z","status":"Analyzed","sourceIdentifier":"info@cert.vde.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-252"],"affected":["wago/750-823 firmware","wago/750-829 firmware","wago/750-831 firmware","wago/750-832 firmware","wago/750-852 firmware","wago/750-862 firmware","wago/750-880 firmware","wago/750-881 firmware","wago/750-882 firmware","wago/750-885 firmware","wago/750-889 firmware","wago/750-890 firmware","wago/750-891 firmware","wago/750-893 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/codesys"],"epss":{"score":0.00903,"percentile":0.59518,"date":"2026-10-26","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 (0.90%). 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?eID=dumpFile&t=f&f=16876&token=a3f1d937f95e7034879f4f2ea8e5a99b168256a7&download=","tags":["Vendor Advisory"],"source":"info@cert.vde.com"},{"url":"https://www.tenable.com/security/research/tra-2021-47","tags":["Exploit","Third Party Advisory"],"source":"info@cert.vde.com"},{"url":"https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=16876&token=a3f1d937f95e7034879f4f2ea8e5a99b168256a7&download=","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.tenable.com/security/research/tra-2021-47","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-34585","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."}