Public proof of conceptFix available

CVE-2021-21014

Q: Is CVE-2021-21014 actively exploited?

Active exploitation of CVE-2021-21014 has not been confirmed. Its EPSS score was 4.2% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-21014?

CVE-2021-21014 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.

A public proof of concept exists; no exploitation attested.

Published2021-02-11
Fixed in2.4.2 · 2.3.6 · 2.3.6-p1
WeaknessCWE-434

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

Magento versions 2.4.1 (and earlier), 2.4.0-p1 (and earlier) and 2.3.6 (and earlier) are vulnerable to a file upload restriction bypass. Successful exploitation could lead to arbitrary code execution by an authenticated attacker. Access to the admin console is required for successful exploitation.

Timeline

dates in UTC

2021-02-1121:15CVE publishedNVD
2026-10-2319:23First public proof of conceptPoC-in-GitHub

Observed activity

isMalicious corpus · updated 2026-10-23 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-2021-21014?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-21014?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

OSV · NVD

Magento

Branch	Affected	Fixed in	Source
2.4	≥ 2.4.0, < 2.4.2	2.4.2	OSV
2.3	< 2.3.6	2.3.6	NVD · OSV
2.3	< 2.3.6-p1	2.3.6-p1	OSV
2.3	= 2.3.6	no fix published	NVD
2.4	= 2.4.0	no fix published	NVD
2.4	= 2.4.1	no fix published	NVD

magento/project-community-edition

Branch	Affected	Fixed in	Source
2.0	≤ 2.0.2	no fix published	OSV

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

Fix

Update Magento to 2.4.2 · 2.3.6 · 2.3.6-p1

Advisories and patches

helpx.adobe.comVendor Advisory

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 1 repository, unverifiedHoangKien1020/CVE-2021-21014

Sources

CNACVSS 3.09.1read 2026-10-23
NVDCVSS 2.06.5read 2026-10-23
CNAweakness (CWE)CWE-434read 2026-10-23
FIRST EPSSEPSS score4.2 %2026-10-23
PoC-in-GitHubproof of concept1read 2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Published: 2021-02-11
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-21014?

Is CVE-2021-21014 actively exploited?

Active exploitation of CVE-2021-21014 has not been confirmed. Its EPSS score was 4.2% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-21014?

CVE-2021-21014 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.

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