CVE-2020-27788

5.5 mediumEPSS 0.3%

Medium (5.5) in upx upx. EPSS 0.3% chance of exploitation in the next 30 days.

An out-of-bounds read access vulnerability was discovered in UPX in PackLinuxElf64::canPack() 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.

Severity

CVSS 3.1

5.5 medium

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 26% of CVEs (scores of 2026-10-31)
CWE: CWE-125
Published: 2022-08-18
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

upx:upx

References

https://github.com/upx/upx/commit/1bb93d4fce9f1d764ba57bf5ac154af515b3fc83
https://github.com/upx/upx/issues/332
https://github.com/upx/upx/commit/1bb93d4fce9f1d764ba57bf5ac154af515b3fc83
https://github.com/upx/upx/issues/332

Check your stack JSON