Security readout for executives and security teams
Plain-English summary
CVE-2021-39217 affects OpenMage LTS e-commerce sites. An authenticated admin could abuse Custom Layout block methods to run arbitrary commands on the server. The attacker already needs high privileges, but successful misuse can fully compromise confidentiality, integrity, and availability.
Executive priority
Prioritize patching affected OpenMage stores because the business impact can be full server compromise. Urgency is high, especially for stores with multiple admins or weak admin controls.
Technical view
OpenMage magento-lts before 19.4.22, and 20.0.0 through before 20.0.19, allowed arbitrary command execution through Custom Layout updates using block methods. The issue is classified as CWE-77 with CVSS 3.1 score 7.2 and high privileges required.
Likely exposure
Exposure is limited to OpenMage magento-lts installations on affected versions. Risk is highest where admin access is broadly delegated, weakly protected, or already compromised.
Exploitation context
The bundle does not show CISA KEV listing or other evidence of active exploitation. Exploitation requires authenticated admin-level access, but impact is severe if that access is abused.
Researcher notes
Do not generalize beyond OpenMage magento-lts from the provided evidence. The key condition is high-privilege admin access to Custom Layout behavior. The public sources identify fixed versions, not a separate workaround.
Mitigation direction
- Upgrade 19.x deployments to 19.4.22 or later.
- Upgrade 20.x deployments to 20.0.19 or later.
- Review vendor advisory and release notes before maintenance.
- Restrict admin access to trusted users only.
- Remove unnecessary Custom Layout privileges where feasible.
- Strengthen admin account protection and monitoring.
Validation and detection
- Inventory OpenMage magento-lts versions across all stores.
- Confirm affected deployments are at 19.4.22, 20.0.19, or later.
- Verify the referenced patch is present in deployed code.
- Review admin roles with Custom Layout capabilities.
- Check admin activity logs for unexpected layout changes.
- Confirm no untrusted users hold admin privileges.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-77: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-39217 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H1.25.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.2HighVector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/OpenMage/magento-lts/security/advisories/GHSA-c9q3-r4rv-mjm7CVE reference · x_refsource_CONFIRM
- https://github.com/OpenMage/magento-lts/commit/289bd4b4f53622138e3e5c2d2cef7502d780086fCVE reference · x_refsource_MISC
- https://github.com/OpenMage/magento-lts/releases/tag/v19.4.22CVE reference · x_refsource_MISC
- https://github.com/OpenMage/magento-lts/releases/tag/v20.0.19CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Special Elements used in a Command ('Command Injection')
Improper Neutralization of Special Elements used in a Command ('Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.