{"cve":"CVE-2021-31883","nvd":{"published":"2021-11-09T12:15:09.383","modified":"2026-06-17T03:52:24.653","status":"Modified","description":"A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303). When processing a DHCP ACK message, the DHCP client application does not validate the length of the Vendor option(s), leading to Denial-of-Service conditions. (FSMD-2021-0013)","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-119"],"references":["https://cert-portal.siemens.com/productcert/html/ssa-044112.html","https://cert-portal.siemens.com/productcert/html/ssa-114589.html","https://cert-portal.siemens.com/productcert/html/ssa-620288.html","https://cert-portal.siemens.com/productcert/pdf/ssa-044112.pdf","https://cert-portal.siemens.com/productcert/pdf/ssa-114589.pdf"],"products":["siemens:apogee_modular_building_controller_firmware","siemens:apogee_modular_equiment_controller_firmware","siemens:apogee_pxc_compact_firmware","siemens:apogee_pxc_modular_firmware","siemens:capital_vstar","siemens:nucleus_net","siemens:nucleus_readystart_v3","siemens:nucleus_source_code","siemens:talon_tc_compact_firmware","siemens:talon_tc_modular_firmware"],"source":"nvd","synced_at":"2026-10-19T21:24:39.218183596+00:00"},"epss":{"cve":"CVE-2021-31883","score":0.01526,"percentile":0.74686,"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."]}