CVE-2021-3838

CRITICAL EPSS 69.7%
Published Nov 15, 20241y ago · Modified Jun 17, 20262w ago
9.8 CVSS 3.1
Critical
Find Similar
Published Nov 15, 2024 1y ago
Last Modified Jun 17, 2026 2w ago

Description

DomPDF before version 2.0.0 is vulnerable to PHAR deserialization due to a lack of checking on the protocol before passing it into the file_get_contents() function. An attacker who can upload files of any type to the server can pass in the phar:// protocol to unserialize the uploaded file and instantiate arbitrary PHP objects. This can lead to remote code execution, especially when DOMPdf is used with frameworks with documented POP chains like Laravel or vulnerable developer code.

CVSS Details

Base Score
9.8
Exploitability
3.9
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
69.7% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-502 Deserialization of Untrusted Data Validation

Affected Products 1

VendorProductVersionRange
dompdf_projectdompdf* <2.0.0

References 2

  • github.com https://github.com/dompdf/dompdf/commit/99aeec1efec9213e87098d42eb09439e7ee0bb6a
    Patch
  • huntr.com https://huntr.com/bounties/0bdddc12-ff67-4815-ab9f-6011a974f48e
    ExploitIssue TrackingPatchThird Party Advisory

Remediation

  • github.com https://github.com/dompdf/dompdf/commit/99aeec1efec9213e87098d42eb09439e7ee0bb6a
    Patch
  • huntr.com https://huntr.com/bounties/0bdddc12-ff67-4815-ab9f-6011a974f48e
    ExploitIssue TrackingPatchThird Party Advisory