What’s Vulnerable › Vulnerabilities
CVE-2021-43312
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.8% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2023-03-24 · updated 2026-06-17
- Weakness: CWE-119
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 products
- upx: before 4.0.0 — fixed in 4.0.0
How to fix
Upgrade to a fixed version: upx 4.0.0. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2021-43312 or the next vulnerability affects your stack