Security readout for executives and security teams
Plain-English summary
CVE-2021-4449 affects the ZoomSounds WordPress plugin. Versions up to and including 5.96 reportedly allow unauthenticated file uploads because file type validation is missing. For an exposed WordPress site, this can let an attacker place arbitrary files on the server and may lead to full site compromise.
Executive priority
Prioritize internet-facing WordPress assets using this plugin. The risk is site takeover or malware staging, with no authentication barrier described in the CVE bundle.
Technical view
The issue is CWE-434 in ZoomSounds savepng.php. The CVE record describes missing file type validation, enabling unauthenticated arbitrary file upload on affected servers, with possible remote code execution. CVE-2021-4457 is identified as a duplicate. CVSS 3.1 is 9.8, network exploitable, low complexity, no privileges or user interaction required.
Likely exposure
Exposure is likely limited to WordPress sites running ZoomSounds - WordPress Wave Audio Player with Playlist, especially versions up to 5.96, reachable from the internet.
Exploitation context
The bundle includes public exploit-oriented references, but KEV is false and no provided source establishes active exploitation. Treat public-facing vulnerable installations as high risk.
Researcher notes
Evidence is strong for vulnerability class, affected plugin, affected range, and severity. The bundle does not name a fixed version or vendor mitigation. Avoid assuming exploitation in the wild without KEV or another cited active-exploitation source.
Mitigation direction
- Inventory WordPress sites for ZoomSounds and identify any version up to 5.96.
- Check vendor, Wordfence, or WPScan guidance for a confirmed fixed version.
- Disable or remove the plugin if no confirmed safe update is available.
- Restrict execution from upload directories where feasible.
- Review WordPress and server logs for suspicious unauthenticated upload activity.
Validation and detection
- Confirm whether ZoomSounds is installed on each WordPress site.
- Record installed plugin version and compare against the up-to-5.96 affected range.
- Review web server logs for requests to the referenced savepng.php file.
- Inspect upload and plugin directories for unexpected executable files.
- Verify any remediation by rechecking plugin presence, version, and exposed routes.
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-434: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-4449 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
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/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:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.wordfence.com/threat-intel/vulnerabilities/id/262e3bb3-bc83-4d0b-8056-9f94ec141b8f?source=cveCVE reference
- https://ithemes.com/blog/wordpress-vulnerability-report-june-2021-part-5/#ib-toc-anchor-2CVE reference
- https://wpscan.com/vulnerability/07259a61-8ba9-4dd0-8d52-cc1df389c0adCVE reference
- https://sploitus.com/exploit?id=WPEX-ID:07259A61-8BA9-4DD0-8D52-CC1DF389C0ADCVE reference
- https://github.com/0xAgun/Arbitrary-File-Upload-ZoomSoundsCVE reference
- https://codecanyon.net/item/zoomsounds-wordpress-wave-audio-player-with-playlist/6181433CVE reference
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.
Unrestricted Upload of File with Dangerous Type
Unrestricted Upload of File with Dangerous Type represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.