{"cve":"CVE-2021-30501","nvd":{"published":"2021-05-27T00:15:08.527","modified":"2026-06-17T03:50:21.117","status":"Modified","description":"An assertion abort was found in upx MemBuffer::alloc() in mem.cpp, in version UPX 4.0.0. The flow allows attackers to cause a denial of service (abort) via a crafted file.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-617","CWE-20"],"references":["https://bugzilla.redhat.com/show_bug.cgi?id=1948696","https://github.com/upx/upx/commit/28e761cd42211dfe0124b7a29b2f74730f453e46","https://github.com/upx/upx/issues/486","https://github.com/upx/upx/pull/487","https://bugzilla.redhat.com/show_bug.cgi?id=1948696"],"products":["fedoraproject:fedora","redhat:enterprise_linux","upx:upx"],"source":"nvd","synced_at":"2026-10-19T21:18:09.669877188+00:00"},"epss":{"cve":"CVE-2021-30501","score":0.01041,"percentile":0.64044,"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."]}