Vulnerability · Published Aug 24, 2022 · Assigned by redhat
CVE-2021-4217
Low 3.3
In plain English
A low-severity null pointer dereference in unzip. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)3.3Low
Exploit odds (30 days)0.6%top 49.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | unzip | 6.0-r11 | ALPINE-CVE-2021-4217 |
| Alpine:v3.21 | unzip | 6.0-r11 | ALPINE-CVE-2021-4217 |
| Alpine:v3.22 | unzip | 6.0-r11 | ALPINE-CVE-2021-4217 |
| Alpine:v3.23 | unzip | 6.0-r11 | ALPINE-CVE-2021-4217 |
| Alpine:v3.24 | unzip | 6.0-r11 | ALPINE-CVE-2021-4217 |
| Debian:12 | unzip | no fix listed | DEBIAN-CVE-2021-4217 |
| Debian:13 | unzip | no fix listed | DEBIAN-CVE-2021-4217 |
| Debian:14 | unzip | no fix listed | DEBIAN-CVE-2021-4217 |
| Ubuntu:22.04:LTS | unzip | 6.0-26ubuntu3.1 | USN-5673-1 |
| Ubuntu:22.04:LTS | unzip | 6.0-26ubuntu3.1 | UBUNTU-CVE-2021-4217 |
| Ubuntu:24.04:LTS | unzip | 6.0-28ubuntu4.1 | UBUNTU-CVE-2021-4217 |
| Ubuntu:24.04:LTS | unzip | 6.0-28ubuntu4.1 | USN-7054-1 |
Affected products (as reported)
Weakness: CWE-476
References
- https://bugs.launchpad.net/ubuntu/+source/unzip/+bug/1957077 x_refsource_MISC
- https://bugzilla.redhat.com/show_bug.cgi?id=2044583 x_refsource_MISC
- https://access.redhat.com/security/cve/CVE-2021-4217 x_refsource_MISC