CVE-2021-21426

Fixes a bug in Zend Framework's Stream HTTP Wrapper

CRITICAL

9.8

CVSS Score

Published: April 21, 2021 at 08:15 PM UTC

Updated: June 17, 2026 at 03:35 AM UTC

1 product affected across 1 vendorMagento

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Severity

CRITICAL9.8

Exploit prediction

EPSS 1%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Magento · Openmagecomposer

95%

v ≤ 19.4.12v < 19.4.1320.0.0 ≤ v < 20.0.9<= 20.0.8

Affected range stops below 19.4.13, so it looks safe — our inference, not a vendor statement

Affected range stops below 20.0.9, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

x_refsource_CONFIRMThird Party Advisory

Source: [email protected]

https://github.com/OpenMage/magento-lts/security/advisories/GHSA-m496-x567-f98c

CVSS

9.8CRITICALGitHub_M

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-502

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