{"cve":"CVE-2021-34596","nvd":{"published":"2021-10-26T10:15:08.127","modified":"2026-06-17T03:56:12.393","status":"Analyzed","description":"A crafted request may cause a read access to an uninitialized pointer in CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT prior to versions V2.4.7.56, resulting in a denial-of-service condition.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":6.5},"cwes":["CWE-824"],"references":["https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=16878&token=e5644ec405590e66aefa62304cb8632df9fc9e9c&download=","https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=16878&token=e5644ec405590e66aefa62304cb8632df9fc9e9c&download="],"products":["codesys:codesys","codesys:plcwinnt","codesys:runtime_toolkit","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","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"],"source":"nvd","synced_at":"2026-10-19T21:24:39.218183596+00:00"},"epss":{"cve":"CVE-2021-34596","score":0.00832,"percentile":0.57631,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}