CVE-2021-20285

A flaw was found in upx canPack in p_lx_elf.cpp in UPX 3.96. This flaw allows attackers to cause a denial of service (SEGV or buffer overflow and application crash) or possibly have unspecified other impacts via a crafted ELF. The highest threat from this vulnerability is to system availability.

• CWE-119
• CWE-787

• https://bugzilla.redhat.com/show_bug.cgi?id=1937787Issue Tracking, Third Party Advisory
• https://github.com/upx/upx/issues/421Exploit, Issue Tracking, Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=1937787Issue Tracking, Third Party Advisory
• https://github.com/upx/upx/issues/421Exploit, Issue Tracking, Third Party Advisory

Published

Mar 26, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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