{"cve":"CVE-2021-40516","nvd":{"published":"2021-09-05T18:15:07.260","modified":"2026-06-17T04:07:04.293","status":"Modified","description":"WeeChat before 3.2.1 allows remote attackers to cause a denial of service (crash) via a crafted WebSocket frame that trigger an out-of-bounds read in plugins/relay/relay-websocket.c in the Relay plugin.","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-125"],"references":["https://github.com/weechat/weechat/commit/8b1331f98de1714bae15a9ca2e2b393ba49d735b","https://lists.debian.org/debian-lts-announce/2021/09/msg00018.html","https://weechat.org/doc/security/","https://github.com/weechat/weechat/commit/8b1331f98de1714bae15a9ca2e2b393ba49d735b","https://lists.debian.org/debian-lts-announce/2021/09/msg00018.html"],"products":["debian:debian_linux","weechat:weechat"],"source":"nvd","synced_at":"2026-10-19T21:21:57.125947417+00:00"},"epss":{"cve":"CVE-2021-40516","score":0.01594,"percentile":0.75717,"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."]}