Vulnerability · Published Aug 25, 2022 · Assigned by redhat
CVE-2020-27801
High 7.8
In plain English
A high-severity memory corruption in upx. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.8High
Exploit odds (30 days)0.4%top 67.9% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
A heap-based buffer over-read was discovered in the get_le64 function in bele.h in UPX 4.0.0 via a crafted Mach-O file.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | upx | 4.0.0-r0 | ALPINE-CVE-2020-27801 |
| Alpine:v3.21 | upx | 4.0.0-r0 | ALPINE-CVE-2020-27801 |
| Alpine:v3.22 | upx | 4.0.0-r0 | ALPINE-CVE-2020-27801 |
| Alpine:v3.23 | upx | 4.0.0-r0 | ALPINE-CVE-2020-27801 |
| Alpine:v3.24 | upx | 4.0.0-r0 | ALPINE-CVE-2020-27801 |
| Debian:13 | upx-ucl | 4.2.2-1 | DEBIAN-CVE-2020-27801 |
| Debian:14 | upx-ucl | 4.2.2-1 | DEBIAN-CVE-2020-27801 |
| Ubuntu:22.04:LTS | upx-ucl | no fix listed | UBUNTU-CVE-2020-27801 |
| Ubuntu:24.04:LTS | upx-ucl | no fix listed | UBUNTU-CVE-2020-27801 |
| Ubuntu:25.10 | upx-ucl | no fix listed | UBUNTU-CVE-2020-27801 |
| Ubuntu:26.04:LTS | upx-ucl | no fix listed | UBUNTU-CVE-2020-27801 |
| Ubuntu:26.10 | upx-ucl | no fix listed | UBUNTU-CVE-2020-27801 |
Affected products (as reported)
Weakness: CWE-119
References
- https://github.com/upx/upx/issues/394 x_refsource_MISC