{"cve":"CVE-2021-20864","nvd":{"published":"2021-12-01T03:15:07.273","modified":"2026-06-17T03:34:33.893","status":"Modified","description":"Improper access control vulnerability in ELECOM routers (WRC-1167GST2 firmware v1.25 and prior, WRC-1167GST2A firmware v1.25 and prior, WRC-1167GST2H firmware v1.25 and prior, WRC-2533GS2-B firmware v1.52 and prior, WRC-2533GS2-W firmware v1.52 and prior, WRC-1750GS firmware v1.03 and prior, WRC-1750GSV firmware v2.11 and prior, WRC-1900GST firmware v1.03 and prior, WRC-2533GST firmware v1.03 and prior, WRC-2533GSTA firmware v1.03 and prior, WRC-2533GST2 firmware v1.25 and prior, WRC-2533GST2SP firmware v1.25 and prior, WRC-2533GST2-G firmware v1.25 and prior, and EDWRC-2533GST2 firmware v1.25 and prior) allows a network-adjacent unauthenticated attacker to bypass access restriction, and to start the telnet service and execute an arbitrary OS command via unspecified vectors.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.8},"cwes":[],"references":["https://jvn.jp/en/vu/JVNVU94527926/index.html","https://www.elecom.co.jp/news/security/20211130-01/","https://jvn.jp/en/vu/JVNVU94527926/index.html","https://www.elecom.co.jp/news/security/20211130-01/"],"products":["elecom:edwrc-2533gst2_firmware","elecom:wrc-1167gst2_firmware","elecom:wrc-1167gst2a_firmware","elecom:wrc-1167gst2h_firmware","elecom:wrc-1750gs_firmware","elecom:wrc-1750gsv_firmware","elecom:wrc-1900gst_firmware","elecom:wrc-2533gs2-b_firmware","elecom:wrc-2533gs2-w_firmware","elecom:wrc-2533gst2-g_firmware","elecom:wrc-2533gst2_firmware","elecom:wrc-2533gst2sp_firmware","elecom:wrc-2533gst_firmware","elecom:wrc-2533gsta_firmware"],"source":"nvd","synced_at":"2026-10-19T21:25:41.256909649+00:00"},"epss":{"cve":"CVE-2021-20864","score":0.00518,"percentile":0.44087,"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."]}