What’s Vulnerable › Vulnerabilities

CVE-2020-27790

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-08-18 · updated 2026-06-17
• Weakness: CWE-369

Description

A floating point exception issue was discovered in UPX in PackLinuxElf64::invert_pt_dynamic() function of p_lx_elf.cpp file. An attacker with a crafted input file could trigger this issue that could cause a crash leading to a denial of service. The highest impact is to Availability.

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/eb90eab6325d009004ffb155e3e33f22d4d3ca26
• https://github.com/upx/upx/issues/331
• https://github.com/upx/upx/commit/eb90eab6325d009004ffb155e3e33f22d4d3ca26
• https://github.com/upx/upx/issues/331

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