{"cve":"CVE-2021-20677","nvd":{"published":"2021-03-26T09:15:11.950","modified":"2026-06-17T03:34:13.880","status":"Modified","description":"UNIVERGE Aspire series PBX (UNIVERGE Aspire WX from 1.00 to 3.51, UNIVERGE Aspire UX from 1.00 to 9.70, UNIVERGE SV9100 from 1.00 to 10.70, and SL2100 from 1.00 to 3.00) allows a remote authenticated attacker to cause system down and a denial of service (DoS) condition by sending a specially crafted command.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L","score":3.1},"cwes":[],"references":["https://jvn.jp/en/jp/JVN12737530/index.html","https://www.necplatforms.co.jp/en/press/security_adv.html","https://jvn.jp/en/jp/JVN12737530/index.html","https://www.necplatforms.co.jp/en/press/security_adv.html"],"products":["necplatforms:sl2100_firmware","necplatforms:univerge_aspire_ux_firmware","necplatforms:univerge_aspire_wx_firmware","necplatforms:univerge_sv9100_firmware"],"source":"nvd","synced_at":"2026-10-19T21:17:01.373894544+00:00"},"epss":{"cve":"CVE-2021-20677","score":0.00952,"percentile":0.61335,"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."]}