CVE-2021-4217
LOWCVSS 3.3/10EPSS 0.57%
Last modified
CVE-2021-4217 is a low-severity vulnerability rated 3.3/10 on the CVSS scale. A flaw was found in unzip. The vulnerability occurs due to improper handling of Unicode strings, which can lead to a null pointer dereference. EPSS estimates a 0.57% chance of exploitation in the next 30 days.
Description
A flaw was found in unzip. The vulnerability occurs due to improper handling of Unicode strings, which can lead to a null pointer dereference. This flaw allows an attacker to input a specially crafted zip file, leading to a crash or code execution.
Metrics
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Unzip Project | Unzip | 6.0 |
| Fedoraproject | Fedora | 35 |
| Redhat | Enterprise Linux | 6.0 |
| Redhat | Enterprise Linux | 7.0 |
| Redhat | Enterprise Linux | 8.0 |
| Redhat | Enterprise Linux | 9.0 |
References
- https://access.redhat.com/security/cve/CVE-2021-4217Third Party Advisory
- https://bugs.launchpad.net/ubuntu/+source/unzip/+bug/1957077Exploit, Issue Tracking, Patch, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2044583Exploit, Issue Tracking, Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2021-4217Third Party Advisory
- https://bugs.launchpad.net/ubuntu/+source/unzip/+bug/1957077Exploit, Issue Tracking, Patch, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2044583Exploit, Issue Tracking, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-4217?
A flaw was found in unzip. The vulnerability occurs due to improper handling of Unicode strings, which can lead to a null pointer dereference. This flaw allows an attacker to input a specially crafted zip file, leading to a crash or code execution.
How severe is CVE-2021-4217?
CVE-2021-4217 has a CVSS score of 3.3/10 (LOW severity). The EPSS model estimates a 0.57% probability of exploitation in the next 30 days.
How do I fix CVE-2021-4217?
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-2021-4217?
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Scan your code nowSource: NVD / NIST