What is CVE-2021-43421?

CVE-2021-43421 is a critical-severity vulnerability in Std42 Elfinder, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2022-04-07.

How severe is CVE-2021-43421?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2021-43421 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Arbitrary file upload in Std42 Elfinder

CVE-2021-43421

A File Upload vulnerability exists in Studio-42 elFinder 2.0.4 to 2.1.59 via connector.minimal.php, which allows a remote malicious user to upload arbitrary files and execute PHP code.

Vulnerability class: Unrestricted File Upload

EPSS: 0.428 (98.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Std42 Elfinder
N/a — versions n/a

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

Public proof-of-concept exploits

References

cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC, Issue Tracking)
cve@mitre.org (Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-43421?: CVE-2021-43421 is a critical-severity vulnerability in Std42 Elfinder, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2022-04-07.
How severe is CVE-2021-43421?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-43421 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.