What’s Vulnerable › Vulnerabilities

CVE-2020-27787

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-08-18 · updated 2026-06-17
• Weakness: CWE-119

Description

A Segmentaation fault was found in UPX in invert_pt_dynamic() function in p_lx_elf.cpp. An attacker with a crafted input file allows invalid memory address access that could lead to a denial of service.

Affected products

• upx: before 3.96 — fixed in 3.96

How to fix

Upgrade to a fixed version: upx 3.96. Check the vendor advisory for mitigations.

References

• https://github.com/upx/upx/commit/e2f60adc95334f47e286838dac33160819c5d74d
• https://github.com/upx/upx/issues/333
• https://github.com/upx/upx/commit/e2f60adc95334f47e286838dac33160819c5d74d
• https://github.com/upx/upx/issues/333

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