CVE-2021-21426

Description

### Impact CVE-2021-3007: Backport of Zend_Http_Response_Stream, added certain type checking as a way to prevent exploitation. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3007 This vulnerability is caused by the unsecured deserialization of an object. In versions higher than Zend Framework 3.0.0, the attacker abuses the Zend3 feature that loads classes from objects in order to upload and execute malicious code in the server. The code can be uploaded using the “callback” parameter, which in this case inserts a malicious code instead of the “callbackOptions” array. ### Patches _Has the problem been patched? What versions should users upgrade to?_ v20.0.9 v19.4.13

How to fix CVE-2021-21426

To remediate CVE-2021-21426, upgrade the affected package to a fixed version below.

• —upgrade to 19.4.13 or later

Is CVE-2021-21426 being exploited?

Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.

Affected packages (1)

• from 0, < 19.4.13

CVSS scores

References (2)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-21426
• WEBgithub.com/OpenMage/magento-lts/security/advisories/GHSA-m496-x567-f98c