CVE-2021-36040 | Magento Commerce Improper Input Validation Could Lead To Remote Code Execution

Magento Commerce versions 2.4.2 (and earlier), 2.4.2-p1 (and earlier) and 2.3.7 (and earlier) are affected by an improper input validation vulnerability. An attacker with admin privileges can upload a specially crafted file to bypass file extension restrictions and could lead to remote code execution.

Published: 2021-09-01 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-36040 is rated High Risk (66.2/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 2.87%). High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-36040

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-25 2.77% 2.87% +0.09%
2 2026-06-15 3.45% 2.77% -0.67%
3 2025-11-21 — 3.45% —

Full EPSS history (15 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-36040

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.1 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:H)
They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.3 6.0 [email protected]
7.2 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:H)
They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.2 5.9 [email protected]
6.5 2.0 MEDIUM
AV:N/AC:L/Au:S/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.0 6.4 [email protected]

Weakness enumeration for CVE-2021-36040

GitHub Security Advisory for CVE-2021-36040

GHSA-2pq5-gpqf-g4r3 · Severity: critical · Ecosystem: composer — Magento has a file extension restrictions bypass

Affected software / configurations for CVE-2021-36040

Vendor Product Version Raw CPE
adobe adobe_commerce >= 2.3.0, <= 2.3.7 cpe:2.3:a:adobe:adobe_commerce:*:*:*:*:*:*:*:*
adobe adobe_commerce >= 2.4.0, <= 2.4.2 cpe:2.3:a:adobe:adobe_commerce:*:*:*:*:*:*:*:*
adobe adobe_commerce 2.4.2 cpe:2.3:a:adobe:adobe_commerce:2.4.2:p1:*:*:*:*:*:*
adobe magento_open_source >= 2.3.0, <= 2.3.7 cpe:2.3:a:adobe:magento_open_source:*:*:*:*:*:*:*:*
adobe magento_open_source >= 2.4.0, <= 2.4.2 cpe:2.3:a:adobe:magento_open_source:*:*:*:*:*:*:*:*
adobe magento_open_source 2.4.2 cpe:2.3:a:adobe:magento_open_source:2.4.2:p1:*:*:*:*:*:*

References for CVE-2021-36040

cvelogic Threat Intelligence