Vulnerability DatabaseCVE-2021-3902
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CVE-2021-3902
Published:November 15, 2024
Updated:May 18, 2026
An improper restriction of external entities (XXE) vulnerability in dompdf/dompdf's SVG parser allows for Server-Side Request Forgery (SSRF) and deserialization attacks. This issue affects all versions prior to 2.0.0. The vulnerability can be exploited even if the isRemoteEnabled option is set to false. It allows attackers to perform SSRF, disclose internal image files, and cause PHAR deserialization attacks.
Related Resources (6)
https://huntr.com/bounties/a6071c07-806f-429a-8656-a4742e4191b1
https://nvd.nist.gov/vuln/detail/CVE-2021-3902
https://security-tracker.debian.org/tracker/CVE-2021-3902
https://github.com/dompdf/dompdf/commit/f56bc8e40be6c0ae0825e6c7396f4db80620b799
https://huntr.dev/bounties/a6071c07-806f-429a-8656-a4742e4191b1/
https://github.com/dompdf/dompdf
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CVSS v4
Base Score:
9.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
9.8
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Improper Restriction of XML External Entity Reference
CWE-611
EPSS
Base Score:
5.09