CVE-2020-27788

Name: CVE-2020-27788
Creator: NVD / NIST
Published: 2022-08-18T20:15:08.947+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.32%

Last modified Jun 17, 2026

CVE-2020-27788 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. 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.. EPSS estimates a 0.32% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

0.32%

23.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Upx	Upx	< 3.96

References

https://github.com/upx/upx/commit/1bb93d4fce9f1d764ba57bf5ac154af515b3fc83Patch, Third Party Advisory
https://github.com/upx/upx/issues/332Exploit, Issue Tracking, Patch, Third Party Advisory
https://github.com/upx/upx/commit/1bb93d4fce9f1d764ba57bf5ac154af515b3fc83Patch, Third Party Advisory
https://github.com/upx/upx/issues/332Exploit, Issue Tracking, Patch, Third Party Advisory

Timeline

Published: Aug 18, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-27788?

How severe is CVE-2020-27788?

CVE-2020-27788 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.32% probability of exploitation in the next 30 days.

How do I fix CVE-2020-27788?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-27788?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST