CVE-2020-27799: Upx

High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days.

A heap-based buffer over-read was discovered in the acc_ua_get_be32 function in miniacc.h in UPX 4.0.0 via a crafted Mach-O file.

Affected products

• Upx Upx: version 4.0.0 only

Published 2022-08-25. Last modified 2026-06-17.