CVE-2021-30500
HIGHCVSS 7.8/10EPSS 1.23%
Last modified
CVE-2021-30500 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. Null pointer dereference was found in upx PackLinuxElf::canUnpack() in p_lx_elf.cpp,in version UPX 4.0.0. That allow attackers to execute arbitrary code and cause a denial of service via a crafted file.. EPSS estimates a 1.23% chance of exploitation in the next 30 days.
Description
Null pointer dereference was found in upx PackLinuxElf::canUnpack() in p_lx_elf.cpp,in version UPX 4.0.0. That allow attackers to execute arbitrary code and cause a denial of service via a crafted file.
Metrics
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Upx | Upx | 4.0.0 |
| Redhat | Enterprise Linux | 7.0 |
| Fedoraproject | Fedora | 33 |
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1948692Issue Tracking, Third Party Advisory
- https://github.com/upx/upx/commit/90279abdfcd235172eab99651043051188938dccPatch, Third Party Advisory
- https://github.com/upx/upx/issues/485Exploit, Issue Tracking, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1948692Issue Tracking, Third Party Advisory
- https://github.com/upx/upx/commit/90279abdfcd235172eab99651043051188938dccPatch, Third Party Advisory
- https://github.com/upx/upx/issues/485Exploit, Issue Tracking, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-30500?
Null pointer dereference was found in upx PackLinuxElf::canUnpack() in p_lx_elf.cpp,in version UPX 4.0.0. That allow attackers to execute arbitrary code and cause a denial of service via a crafted file.
How severe is CVE-2021-30500?
CVE-2021-30500 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 1.23% probability of exploitation in the next 30 days.
How do I fix CVE-2021-30500?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-30500?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST