Vulnerability · Published Mar 24, 2023 · Assigned by fedora
CVE-2021-43312
High 7.5
In plain English
A high-severity memory corruption in upx. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 57% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.5High
Exploit odds (30 days)0.8%top 42.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
A heap-based buffer overflow was discovered in upx, during the variable 'bucket' points to an inaccessible address. The issue is being triggered in the function PackLinuxElf64::invert_pt_dynamic at p_lx_elf.cpp:5239.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | upx-ucl | 4.2.2-1 | DEBIAN-CVE-2021-43312 |
| Debian:14 | upx-ucl | 4.2.2-1 | DEBIAN-CVE-2021-43312 |
| Ubuntu:22.04:LTS | upx-ucl | no fix listed | UBUNTU-CVE-2021-43312 |
| Ubuntu:24.04:LTS | upx-ucl | no fix listed | UBUNTU-CVE-2021-43312 |
| Ubuntu:25.10 | upx-ucl | no fix listed | UBUNTU-CVE-2021-43312 |
| Ubuntu:26.04:LTS | upx-ucl | no fix listed | UBUNTU-CVE-2021-43312 |
| Ubuntu:26.10 | upx-ucl | no fix listed | UBUNTU-CVE-2021-43312 |
Affected products (as reported)
Weakness: CWE-119