AUGUST 4, 2026
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Case File

CVE-2021-3838

CRITICAL · CVSS 9.8 EPSS 1.43% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2024-11-15 · Last synced 2026-08-04

CyberRota Analysis

This is a critical severity vulnerability with a CVSS score of 9.8. Public exploit code or proof-of-concept references have been detected in its references. It may be remotely exploitable.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Detected Signals
remote code execution code execution
GitHub PoC Links

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2021-3838
Severity
CRITICAL
CVSS
9.8
EPSS
1.43%

Original NVD 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.

Related CVEs

Other vulnerabilities affecting the same vendor(s)