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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.010 (59.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 60th percentile — 59.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000
Affected products
- Dompdf Dompdf/dompdf — versions unspecified
- Dompdf Project
Weakness classification (CWE)
Public proof-of-concept exploits
References
- huntr.com/bounties/a6071c07-806f-429a-8656-a4742e4191b1 (Exploit, Patch, Third Party Advisory, Issue Tracking)
- github.com/dompdf/dompdf/commit/f56bc8e40be6c0ae0825e6c7396f4db80620b799 (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.