CRITICAL

CVE-2021-3902

CVSS v3

9.8

CRITICAL

EPSS Score

1.0 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

dompdf/dompdfPackagistall versions · fixed in 2.0.0

Full record on NVD

Description

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.

Technical details

Published: 2024-11-15

Frequently asked questions

What is CVE-2021-3902?

Is CVE-2021-3902 actively exploited?

Active exploitation of CVE-2021-3902 has not been confirmed. Its EPSS score was 1.0% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-3902?

CVE-2021-3902 has a CVSS v3 base score of 9.8 (CRITICAL severity).

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