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Vulnerability record · CVE-2021-4287 · published 27 December 2022

CVE-2021-4287: Microsoft binwalk link following vulnerability

Microsoft · Binwalk

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.

6.5 CVSS 3.1 Medium EPSS 1.9% · top 20.6% CWE-61 · CWE-61CWE-59 · Link following
6.5CVSS 3.1 base score
1.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/ReFirmLabs/binwalk/commit/fa0c0bd59b8588814756942fe4cb5452e76c1dcd PatchThird Party Advisory
https://github.com/ReFirmLabs/binwalk/pull/556 PatchThird Party Advisory
https://github.com/ReFirmLabs/binwalk/releases/tag/v2.3.3 Release NotesThird Party Advisory
https://vuldb.com/?ctiid.216876 Third Party Advisory
https://vuldb.com/?id.216876 Third Party Advisory
https://github.com/ReFirmLabs/binwalk/commit/fa0c0bd59b8588814756942fe4cb5452e76c1dcd PatchThird Party Advisory
https://github.com/ReFirmLabs/binwalk/pull/556 PatchThird Party Advisory
https://github.com/ReFirmLabs/binwalk/releases/tag/v2.3.3 Release NotesThird Party Advisory
https://vuldb.com/?ctiid.216876 Third Party Advisory
https://vuldb.com/?id.216876 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-4287), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.