# CVE-2024-4367

A type check was missing when handling fonts in PDF.js, which would allow arbitrary JavaScript execution in the PDF.js context. This vulnerability affects Firefox < 126, Firefox ESR < 115.11, and Thunderbird < 115.11.

- Page: https://www.vulneraibility.com/cve/CVE-2024-4367
- CVSS: 8.8
- Known exploited: not in CISA KEV as of our last sync
- EPSS: 70.66% (percentile 99.4)
- Public exploit code: 1 on Exploit-DB · 30 GitHub proofs of concept (first 2024-05-20)
- CISA SSVC: exploitation poc, automatable no, technical impact total (assessed 2025-02-26)
- Weakness: CWE-754
- Published: 2024-05-14

## Affected versions

- Mozilla Firefox: affected < 126
- Mozilla Firefox ESR: affected < 115.11
- Mozilla Thunderbird: affected < 115.11

A version outside these ranges is not a statement that it is unaffected.

## References

- [other] https://bugzilla.mozilla.org/show_bug.cgi?id=1893645
- [other] https://www.mozilla.org/security/advisories/mfsa2024-21/
- [other] https://www.mozilla.org/security/advisories/mfsa2024-22/
- [other] https://www.mozilla.org/security/advisories/mfsa2024-23/
- [other] https://lists.debian.org/debian-lts-announce/2024/05/msg00010.html
- [other] https://lists.debian.org/debian-lts-announce/2024/05/msg00012.html
- [other] http://seclists.org/fulldisclosure/2024/Aug/30
- [other] https://github.com/mozilla/pdf.js/releases/tag/v4.2.67
- [other] https://codeanlabs.com/blog/research/cve-2024-4367-arbitrary-js-execution-in-pdf-js/
- [other] https://github.com/gogs/gogs/issues/7928
- [other] https://www.exploit-db.com/exploits/52273
- [other] https://cert-portal.siemens.com/productcert/html/ssa-827383.html

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.