🛡️ CVE-2020-27788 on Debian — upx-ucl

⚪ Unknown ✅ No Known Exploit OSV

N/A

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

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.

Distribution advisory

This page covers CVE-2020-27788 as tracked by Debian, for the package upx-ucl. The fix is available in version 3.96-1; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Affected software

DEBIAN-CVE-2020-27788 is recorded against 1 package.

upx-ucl (fixed in 3.96-1)

Timeline and source

Published on 18 August 2022 and last revised on 15 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

security-tracker.debian.org (Advisory)

CVE-2020-27788 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Ubuntu

Details

Severity Unknown

CVSS Score N/A

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

CWE N/A

Public Exploit ✅ No

Source OSV

Published 2022-08-18

Updated 2026-08-20

Modified 2026-08-15

Fix URL N/A

Affected Packages

Software	From version	Fixed in
upx-ucl	—	3.96-1

References

ADVISORY https://security-tracker.debian.org/tracker/CVE-2020-27788

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