What is CVE-2021-3902?

CVE-2021-3902 is a critical-severity vulnerability in Dompdf Dompdf/dompdf, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 9.8/10. Published 2024-11-15.

How severe is CVE-2021-3902?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2021-3902 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XXE in Dompdf Dompdf/dompdf

CVE-2021-3902

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.

Vulnerability class: XXE (XML External Entity)

EPSS: 0.009 (56.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Dompdf Dompdf/dompdf — versions unspecified
Dompdf_project Dompdf

Weakness classification (CWE)

CWE-611 — Improper Restriction of XML External Entity Reference (XXE)

Public proof-of-concept exploits

References

security@huntr.dev (Exploit, Patch, Third Party Advisory, Issue Tracking)
security@huntr.dev (Patch)

Frequently asked questions

What is CVE-2021-3902?: CVE-2021-3902 is a critical-severity vulnerability in Dompdf Dompdf/dompdf, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 9.8/10. Published 2024-11-15.
How severe is CVE-2021-3902?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-3902 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.