Vulnerability · Published Aug 22, 2023 · Assigned by mitre
CVE-2021-46179
Medium 6.5
In plain English
A medium-severity security flaw in the upx-ucl package (Debian). Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)6.5Medium
Exploit odds (30 days)0.5%top 55.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
Reachable Assertion vulnerability in upx before 4.0.0 allows attackers to cause a denial of service via crafted file passed to the the readx function.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | upx-ucl | 4.2.2-1 | DEBIAN-CVE-2021-46179 |
| Debian:14 | upx-ucl | 4.2.2-1 | DEBIAN-CVE-2021-46179 |
| Ubuntu:22.04:LTS | upx-ucl | no fix listed | UBUNTU-CVE-2021-46179 |
| Ubuntu:24.04:LTS | upx-ucl | no fix listed | UBUNTU-CVE-2021-46179 |
| Ubuntu:25.10 | upx-ucl | no fix listed | UBUNTU-CVE-2021-46179 |
| Ubuntu:26.04:LTS | upx-ucl | no fix listed | UBUNTU-CVE-2021-46179 |
| Ubuntu:26.10 | upx-ucl | no fix listed | UBUNTU-CVE-2021-46179 |