{"cve":"CVE-2021-33586","nvd":{"published":"2021-05-27T05:15:06.993","modified":"2026-06-17T03:54:49.877","status":"Modified","description":"InspIRCd 3.8.0 through 3.9.x before 3.10.0 allows any user (able to connect to the server) to access recently deallocated memory, aka the \"malformed PONG\" issue.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","score":4.3},"cwes":["CWE-732"],"references":["https://docs.inspircd.org/security/2021-01/","https://github.com/inspircd/inspircd/commit/4350a11c663b0d75f8119743bffb7736d87abd4d","https://security.gentoo.org/glsa/202107-22","https://docs.inspircd.org/security/2021-01/","https://github.com/inspircd/inspircd/commit/4350a11c663b0d75f8119743bffb7736d87abd4d"],"products":["inspircd:inspircd"],"source":"nvd","synced_at":"2026-10-19T21:18:09.669877188+00:00"},"epss":{"cve":"CVE-2021-33586","score":0.0089,"percentile":0.59387,"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."]}