# CVE-2021-3902: php-dompdf: An improper restriction of external entities (XXE) vulnerability in dompdf/dompdf's SVG parser allows for Server-Side...

CVE-2021-3902 is fixed in php-dompdf on 1 platform by DEBIAN-CVE-2021-3902 (version 2.0.2+dfsg-1), released November 15, 2024. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2021-3902
- Priority: Urgent
- CVSS: 9.8 (critical)
- EPSS: 0.0095
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Nov 15, 2024

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | php-dompdf Debian 12.15 (bookworm) | 2.0.2+dfsg-1 | [DEBIAN-CVE-2021-3902](https://patchblox.com/security/data/fix/linux/debian-cve-2021-3902.md) | Nov 15, 2024 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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