Critical severity · published Apr 21, 2021
CVE-2021-21426
Magento-lts is a long-term support alternative to Magento Community Edition (CE)
9.8
CVSS
1.2%
EPSS
No
On KEV
Description
Magento-lts is a long-term support alternative to Magento Community Edition (CE). In magento-lts versions 19.4.12 and prior and 20.0.8 and prior, there is a vulnerability caused by the unsecured deserialization of an object. A patch in versions 19.4.13 and 20.0.9 was back ported from Zend Framework 3. The vulnerability was assigned CVE-2021-3007 in Zend Framework.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.2% · higher than 68% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MA
Magento · Openmage
before 19.4.13; 20.0.0 before 20.0.9 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-21426
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-21426
Third Party Advisory
https://github.com/OpenMage/magento-lts/security/advisories/GHSA-m496-x567-f98c
More from Magento
8.8
CVE-2026-40488
OpenMage LTS has Customer File Upload Extension Blocklist Bypass that Leads to Remote Code Execution
8.8
CVE-2021-41144
OpenMage LTS is an e-commerce platform
8.1
CVE-2026-25524
OpenMage LTS's Phar Deserialization leads to Remote Code Execution
7.5
CVE-2023-41879
Magento LTS is the official OpenMage LTS codebase
7.5
CVE-2023-23617
OpenMage LTS is an e-commerce platform