Deserialization in Dompdf Dompdf/dompdf
CVE-2021-3838
DomPDF before version 2.0.0 is vulnerable to PHAR deserialization due to a lack of checking on the protocol before passing it into the file_get_contents() function. An attacker who can upload files of any type to the server can pass in the phar:// protocol to unserialize the uploaded file and instantiate arbitrary PHP objects. This can lead to remote code execution, especially when DOMPdf is used with frameworks with documented POP chains like Laravel or vulnerable developer code.
Vulnerability class: Insecure Deserialization
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: 0.014 (72.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 72.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000
Affected products
- Dompdf Dompdf/dompdf — versions unspecified
- Dompdf Project
Weakness classification (CWE)
Public proof-of-concept exploits
References
- huntr.com/bounties/0bdddc12-ff67-4815-ab9f-6011a974f48e (Exploit, Patch, Third Party Advisory, Issue Tracking)
- github.com/dompdf/dompdf/commit/99aeec1efec9213e87098d42eb09439e7ee0bb6a (Patch)
Frequently asked questions
- What is CVE-2021-3838?
- CVE-2021-3838 is a critical-severity vulnerability in Dompdf Dompdf/dompdf, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2024-11-15.
- How severe is CVE-2021-3838?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-3838 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.