CVE-2021-24284Known exploitationPublic exploitNetwork attack vector

Remote code execution via unchecked ZIP extraction

Published May 14, 2021 · Updated Aug 3, 2024

Unrestricted file upload in SayenThemes Kaswara Modern VC Addons 3.0.1 and earlier allows remote attackers to execute PHP code. The uploadFontIcon AJAX action extracts supplied ZIP archives under wp-content/uploads/kaswara/fonts_icon without rejecting executable PHP files. No authentication or user interaction is required, and an uploaded web shell grants control of the affected WordPress site.

CVSS severity9.8
Critical
EPSS probability42.14%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in SayenThemes Kaswara Modern VC Addons 3.0.1 and earlier allows remote attackers to execute PHP code. The uploadFontIcon AJAX action extracts supplied ZIP archives under wp-content/uploads/kaswara/fonts_icon without rejecting executable PHP files. No authentication or user interaction is required, and an uploaded web shell grants control of the affected WordPress site.

The record

CVE
CVE-2021-24284
Published
May 14, 2021
Updated
Aug 3, 2024
Vendor
SayenThemes
Product
Kaswara Modern VC Addons
Classifications
CWE-434, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 21, 2021Exploitation reportedKaswara arbitrary-upload exploitation campaigns
  2. May 14, 2021CVE publishedPublication date reported by the CVE source.
  3. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.0.1 <=3.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SayenThemes · Kaswara Modern VC Addonsversion=3.0.1 <=3.0.1

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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