CVE-2021-30501: Fedoraproject Fedora

Medium severity, CVSS 5.5. EPSS: 1% chance of exploitation in the next 30 days.

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.

Affected products

• Fedoraproject Fedora: version 33 only
• Red Hat Enterprise Linux: version 7.0 only
• Upx Upx: version 4.0.0 only

Published 2021-05-27. Last modified 2026-06-17.