CVE-2024-3863

Mozilla Firefox vulnerability

9.8 CRITICALEPSS 0.81%

Published16 Apr 2024

Description

The executable file warning was not presented when downloading .xrm-ms files. *Note: This issue only affected Windows operating systems. Other operating systems are unaffected.* This vulnerability affects Firefox < 125, Firefox ESR < 115.10, and Thunderbird < 115.10.

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Mozilla Firefox< 125.0 · < 115.10.0

Mozilla Thunderbird< 115.10

Remediation

Fixed in

Mozilla Firefox≥ 125.0

Mozilla Thunderbird≥ 115.10

Frequently asked

Is CVE-2024-3863 being actively exploited?

CVE-2024-3863 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.81%.

How severe is CVE-2024-3863?

CVE-2024-3863 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.81% probability of exploitation.

Which products are affected by CVE-2024-3863?

Affected products include Mozilla Firefox, Mozilla Thunderbird.

How do I fix CVE-2024-3863?

Upgrade affected software to a fixed version, for example Mozilla Firefox 125.0, Mozilla Thunderbird 115.10 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2024-3863 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.