{"cve":"CVE-2021-31344","nvd":{"published":"2021-11-09T12:15:09.087","modified":"2026-06-17T03:51:35.010","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), PLUSCONTROL 1st Gen (All versions), SIMOTICS CONNECT 400 (All versions < V0.5.0.0), SIMOTICS CONNECT 400 (All versions < V1.0.0.0). ICMP echo packets with fake IP options allow sending ICMP echo reply messages to arbitrary hosts on the network. (FSMD-2021-0004)","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","score":6.9},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3},"cwes":["CWE-843"],"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-223353.html","https://cert-portal.siemens.com/productcert/html/ssa-620288.html","https://cert-portal.siemens.com/productcert/html/ssa-845392.html"],"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_readystart_v4","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-2021-31344","score":0.01456,"percentile":0.73483,"date":"2026-10-31"},"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."]}