CVE-2021-4217
lowA flaw was found in unzip.
Vendor / product: Unzip Project — unzip
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.
CVSS
3.3
3.3 (CVSS v3.1)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2022-08-24 16:15
Modified: 2026-11-02 19:17
NVD status: Modified
Last synced 6 hours ago
Verified against the source API 2026-11-02 19:37 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
unzip_project / unzip 6.0
fedoraproject / fedora 35
redhat / enterprise_linux 6.0, 7.0, 8.0, 9.0
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Patch / mitigation: https://bugs.launchpad.net/ubuntu/+source/unzip/+bug/1957077
Patch / mitigation: https://bugs.launchpad.net/ubuntu/+source/unzip/+bug/1957077
References
- https://access.redhat.com/security/cve/CVE-2021-4217 secalert@redhat.com
- https://bugs.launchpad.net/ubuntu/+source/unzip/+bug/1957077 secalert@redhat.com
- https://bugzilla.redhat.com/show_bug.cgi?id=2044583 secalert@redhat.com
- https://access.redhat.com/security/cve/CVE-2021-4217 af854a3a-2127-422b-91ae-364da2661108
- https://bugs.launchpad.net/ubuntu/+source/unzip/+bug/1957077 af854a3a-2127-422b-91ae-364da2661108
- https://bugzilla.redhat.com/show_bug.cgi?id=2044583 af854a3a-2127-422b-91ae-364da2661108
Data sources
NVD CVE API 2.0 — fetched 2026-11-02 19:37 UTC · record ↗