How severe is CVE-2024-4367?

CVE-2024-4367 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2024-4367 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 73% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-4367?

CVE-2024-4367 primarily affects Mozilla Firefox. In total, 48 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2024-4367?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2024-4367 have an EU (EUVD) identifier?

Yes. CVE-2024-4367 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-1831.

When was CVE-2024-4367 published?

CVE-2024-4367 was published on 2024-05-14 and last updated on 2026-06-17.

CVE-2024-4367

CVE-2024-4367 is a high-severity vulnerability in Mozilla Firefox with a CVSS 3.x base score of 8.8. Its EPSS exploit-prediction score of 73% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-754.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 73% (99th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-1831
Weakness: CWE-754
Affected product: Mozilla Firefox
Published: 2024-05-14
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2024-4367?: CVE-2024-4367 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2024-4367 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 73% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-4367?: CVE-2024-4367 primarily affects Mozilla Firefox. In total, 48 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2024-4367?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2024-4367 have an EU (EUVD) identifier?: Yes. CVE-2024-4367 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-1831.
When was CVE-2024-4367 published?: CVE-2024-4367 was published on 2024-05-14 and last updated on 2026-06-17.

References

Affected products (48)

cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:*:*:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:-:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision10:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision11:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision12:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision13:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision14:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision15:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision16:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision17:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision18:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision19:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision20:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision21:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision22:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision23:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision24:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision25:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision26:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision27:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision28:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision29:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision3:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision30:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision31:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision32:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision33:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision34:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision35:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision36:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision37:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision38:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision39:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision4:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision40:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_appsuite_frontend:7.10.6:revision41:*:*:*:*:*:*

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