CVE-2019-20021

PoC —

CVSS 3.1

5.5 medium

EPSS

1%p64

Published

Dec 27, 2019 (Dec 27, 2019)

Modified

Jun 17, 2026

Description

A heap-based buffer over-read was discovered in canUnpack in p_mach.cpp in UPX 3.95 via a crafted Mach-O file.

Vendors: upx fedoraproject
Products: upx, fedora
Weakness: CWE-125
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

NVD CVE.org GitHub PoCs EPSS (1.1%)

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