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No exploitation reportedFix available

CVE-2021-4287

No exploitation reported by the sources we read.

  • Published2022-12-27
  • Fixed in2.3.3
  • WeaknessCWE-59 · CWE-61

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2022-12-2711:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-4287?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-4287?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Microsoft binwalk
BranchAffectedFixed in
2.3< 2.3.32.3.3

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As VulDB, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • ReFirm Labs binwalk
    Affected
    • = 2.3.0no fix stated
    • = 2.3.1no fix stated
    • = 2.3.2no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2022-12-27

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • binwalkUbuntu:20.04:LTSall versions · no fixed version listed
  • binwalkUbuntu:18.04:LTSall versions · no fixed version listed
  • binwalkDebian:14all versions · fixed in 2.3.3+dfsg1-1
  • binwalkDebian:13all versions · fixed in 2.3.3+dfsg1-1
  • binwalkDebian:12all versions · fixed in 2.3.3+dfsg1-1

Full record on NVD

Fix

  1. Update Microsoft binwalk to 2.3.3

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionnone2025-04-11
  • OpenCVESSVC decisionnone—
  • CNACVSS 3.15known since 2026-10-23
  • NVDCVSS 3.16.5read 2026-10-23
  • CNAweakness (CWE)CWE-61known since 2026-10-23
  • NVDweakness (CWE)CWE-59read 2026-10-23
  • FIRST EPSSEPSS score2.1 %2026-11-03
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryMODERATE2022-12-30

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Published
2022-12-27
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-8m3f-g62j-3vx8

Frequently asked questions

What is CVE-2021-4287?

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.

Is CVE-2021-4287 actively exploited?

Active exploitation of CVE-2021-4287 has not been confirmed. Its EPSS score was 2.1% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-4287?

CVE-2021-4287 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

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