Memory corruption in upx
Priority HIGH 72CWE-119Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.
Summary
A heap-based buffer overflow was discovered in upx, during the generic pointer 'p' points to an inaccessible address in func get_le64().
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00817 57th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | upx | upx before 4.0.0-git-c6b9e3c62d15 | — | No fix listed | CNA |
- upx Vendor— Affected upx before 4.0.0-git-c6b9e3c62d15 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2021-43316
- 2026-10-03 Alias added: GHSA-p7p3-32mv-p6h3
References
More Upx vulnerabilities
- TI-2021-19310 Memory corruption in upx CVSS 3.1HIGH 7.5
- TI-2021-19308 Memory corruption in upx CVSS 3.1HIGH 7.5
- TI-2021-19307 Memory corruption in upx CVSS 3.1HIGH 7.5
- TI-2021-19306 Memory corruption in upx CVSS 3.1HIGH 7.5
- TI-2021-19305 Memory corruption in upx CVSS 3.1HIGH 7.5
- TI-2021-19304 Memory corruption in upx CVSS 3.1HIGH 7.5
Sources
- CVE-2021-43316 · CVE Program
- CVE-2021-43316 · NVD
- FIRST EPSS
- GHSA-p7p3-32mv-p6h3 · GitHub Advisory Database · CC BY 4.0
- CVE-2021-43316 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences