CVE-2020-27799

Name: CVE-2020-27799
Creator: NVD / NIST
Published: 2022-08-25T20:15:08.63+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.31%

Last modified Jun 17, 2026

CVE-2020-27799 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. A heap-based buffer over-read was discovered in the acc_ua_get_be32 function in miniacc.h in UPX 4.0.0 via a crafted Mach-O file.. EPSS estimates a 0.31% chance of exploitation in the next 30 days.

Description

A heap-based buffer over-read was discovered in the acc_ua_get_be32 function in miniacc.h in UPX 4.0.0 via a crafted Mach-O file.

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

0.31%

22.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Upx	Upx	4.0.0

References

https://github.com/upx/upx/issues/391Exploit, Issue Tracking, Third Party Advisory
https://github.com/upx/upx/issues/391Exploit, Issue Tracking, Third Party Advisory

Timeline

Published: Aug 25, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-27799?

A heap-based buffer over-read was discovered in the acc_ua_get_be32 function in miniacc.h in UPX 4.0.0 via a crafted Mach-O file.

How severe is CVE-2020-27799?

CVE-2020-27799 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.31% probability of exploitation in the next 30 days.

How do I fix CVE-2020-27799?

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-2020-27799?

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

Scan your code now

Source: NVD / NIST