CVE-2024-4367
Improper Check for Unusual or Exceptional Conditions
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Description
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.
Official description from the CVE record, published by mozilla. Copyright © 1999-2026 The MITRE Corporation. See /security/cve/legal for the CVE license. View the record on cve.org
Key data
CVSS 3.1 Medium 5.6
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Attack vector: Network
The vulnerable component can be reached over a network, possibly from the Internet.
Attack complexity: High
The attack depends on conditions outside the attacker's control, so it takes preparation.
Privileges required: None
No account or privileges are needed.
User interaction: None
No action from any user is needed.
Scope: Unchanged
The impact stays within the vulnerable component.
Confidentiality impact: Low
Limited effect on the secrecy of data.
Integrity impact: Low
Limited effect on the trustworthiness of data.
Availability impact: Low
Limited effect on availability.
| Metric | Value | What it means |
|---|---|---|
| Attack vector | Network | The vulnerable component can be reached over a network, possibly from the Internet. |
| Attack complexity | High | The attack depends on conditions outside the attacker's control, so it takes preparation. |
| Privileges required | None | No account or privileges are needed. |
| User interaction | None | No action from any user is needed. |
| Scope | Unchanged | The impact stays within the vulnerable component. |
| Confidentiality impact | Low | Limited effect on the secrecy of data. |
| Integrity impact | Low | Limited effect on the trustworthiness of data. |
| Availability impact | Low | Limited effect on availability. |
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EPSS
- Score
- 0.70660 (70.7% probability)
- Percentile
- 99.4%
- Scores of
- Nov 10, 2026
- Model
- v2026.06.15
CISA assessment as of Feb 26, 2025
- Exploitation
- Public proof of concept recorded by CISA
- Automatable
- no
- Technical impact
- total
Weakness (CWE)
- CWE-754Improper Check for Unusual or Exceptional Conditions
Affected products
Mozilla Firefox
- affected: unspecified up to before 126
Mozilla Firefox ESR
- affected: unspecified up to before 115.11
Mozilla Thunderbird
- affected: unspecified up to before 115.11
References
- bugzilla.mozilla.org/show_bug.cgi?id=1893645
- mozilla.org/security/advisories/mfsa2024-21
- mozilla.org/security/advisories/mfsa2024-22
- mozilla.org/security/advisories/mfsa2024-23
- lists.debian.org/debian-lts-announce/2024/05/msg00010.html
- lists.debian.org/debian-lts-announce/2024/05/msg00012.html
- seclists.org/fulldisclosure/2024/Aug/30
- github.com/mozilla/pdf.js/releases/tag/v4.2.67
- codeanlabs.com/blog/research/cve-2024-4367-arbitrary-js-exe…
- github.com/gogs/gogs/issues/7928
- exploit-db.com/exploits/52273
Timeline
- ID reserved
- Record published
- Record last updated
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About CubePath
Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:48 UTC. Sources and licenses