CVE-2021-43617Network attack vector

Remote code execution via unblocked PHAR uploads

Published Nov 14, 2021 · Updated Aug 4, 2024

Unrestricted file upload in Laravel Framework 8.70.2 and earlier allows remote attackers to upload executable PHP via .phar files. The prohibited MIME-type validator in Illuminate/Validation/Concerns/ValidatesAttributes.php rejects .php and .phtml extensions but omits .phar, although Debian PHP-CGI maps .phar to application/x-httpd-php. Code execution requires an application endpoint that accepts uploads and relies on this validation rule, plus a Debian-based web stack that serves the uploaded file through PHP.

CVSS severity9.8
Critical
EPSS probability19.81%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in Laravel Framework 8.70.2 and earlier allows remote attackers to upload executable PHP via .phar files. The prohibited MIME-type validator in Illuminate/Validation/Concerns/ValidatesAttributes.php rejects .php and .phtml extensions but omits .phar, although Debian PHP-CGI maps .phar to application/x-httpd-php. Code execution requires an application endpoint that accepts uploads and relies on this validation rule, plus a Debian-based web stack that serves the uploaded file through PHP.

The record

CVE
CVE-2021-43617
Published
Nov 14, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-434, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 14, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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 exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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