What’s Vulnerable › Vulnerabilities

CVE-2021-4287: ReFirm Labs binwalk Archive Extraction extractor.py symlink

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-12-27 · updated 2026-06-17
• Weakness: CWE-61

Description

A vulnerability, which was classified as problematic, was found in ReFirm Labs binwalk up to 2.3.2. Affected is an unknown function of the file src/binwalk/modules/extractor.py of the component Archive Extraction Handler. The manipulation leads to symlink following. It is possible to launch the attack remotely. Upgrading to version 2.3.3 is able to address this issue. The name of the patch is fa0c0bd59b8588814756942fe4cb5452e76c1dcd. It is recommended to upgrade the affected component. The identifier of this vulnerability is VDB-216876.

Affected products

• Refirm Labs binwalk: before 2.3.3 — fixed in 2.3.3
• Refirm Labs binwalk: 2.3.0, 2.3.1, 2.3.2

How to fix

Upgrade to a fixed version: Refirm Labs binwalk 2.3.3. Check the vendor advisory for mitigations.

References

• https://github.com/ReFirmLabs/binwalk/commit/fa0c0bd59b8588814756942fe4cb5452e76c1dcd
• https://github.com/ReFirmLabs/binwalk/pull/556
• https://github.com/ReFirmLabs/binwalk/releases/tag/v2.3.3
• https://vuldb.com/?ctiid.216876
• https://vuldb.com/?id.216876
• https://github.com/ReFirmLabs/binwalk/commit/fa0c0bd59b8588814756942fe4cb5452e76c1dcd
• https://github.com/ReFirmLabs/binwalk/pull/556
• https://github.com/ReFirmLabs/binwalk/releases/tag/v2.3.3
• https://vuldb.com/?ctiid.216876
• https://vuldb.com/?id.216876

Get alerted when CVE-2021-4287 or the next vulnerability affects your stack