CVE-2021-4449

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2024-10-16. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 5%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

The ZoomSounds plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the 'savepng.php' file in versions up to, and including, 5.96. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible. CVE-2021-4457 is a duplicate of this.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Track)
EG Risk 75/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
91.9%
KEV
Not listed

Published

October 16, 2024

Last Modified

April 8, 2026

Advisory Details (4)

Auto-updated May 18, 2026
⚠️ Active exploitation confirmed. Patch available.
generic🟡 PoC Available

ZoomSounds < 6.05 – Unauthenticated Arbitrary File Upload | CVE 2021-4457 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/07259a61-8ba9-4dd0-8d52-cc1df389c0ad
generic

💀 Exploit for ZoomSounds < 6.05 - Unauthenticated Arbitrary File Upload

https://sploitus.com/exploit?id=WPEX-ID:07259A61-8BA9-4DD0-8D52-CC1DF389C0AD
generic Patch Available🔴 Active Exploitation

WordPress Vulnerability Report: June 2021, Part 5 - SolidWP

https://ithemes.com/blog/wordpress-vulnerability-report-june-2021-part-5/#ib-toc-anchor-2
generic

GitHub - 0xAgun/Arbitrary-File-Upload-ZoomSounds: ZoomSounds < 6.05 allowing unauthenticated users to upload an arbitrary file anywhere on the web server. · GitHub

https://github.com/0xAgun/Arbitrary-File-Upload-ZoomSounds

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 11× in last 7d / 44× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 109 total refreshes for this CVE.

  1. 2026-07-23 14:16 UTCEPSS rescore
  2. 2026-07-23 02:05 UTCEG score recompute
  3. 2026-07-22 22:51 UTCEG score recompute
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  67. 2026-05-21 22:54 UTCGHSA enrichment
  68. 2026-05-20 22:37 UTCEPSS rescore
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Publicly available exploits

(1 reference)

Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Nucleihttp/cves/2021/CVE-2021-4449.yaml
    First seen Jan 1, 2021

    ZoomSounds Plugin - Unauthenticated Arbitrary File Upload

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-4449?
CVE-2021-4449 is a critical vulnerability published on October 16, 2024. The ZoomSounds plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the 'savepng.php' file in versions up to, and including, 5.96. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may…
When was CVE-2021-4449 disclosed?
CVE-2021-4449 was first published in the National Vulnerability Database on October 16, 2024, with the most recent update on April 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-4449 actively exploited?
CVE-2021-4449 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 91.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-4449?
CVE-2021-4449 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2021-4449?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-4449, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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