What’s Vulnerable › Vulnerabilities

CVE-2021-20285

• Severity: medium (CVSS 6.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-03-26 · updated 2026-06-17
• Weakness: CWE-119

Description

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.

Affected products

• upx: 3.96

References

• https://bugzilla.redhat.com/show_bug.cgi?id=1937787
• https://github.com/upx/upx/issues/421
• https://bugzilla.redhat.com/show_bug.cgi?id=1937787
• https://github.com/upx/upx/issues/421

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