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CVE-2025-55031

Mozilla Firefox vulnerability

9.8 CRITICALEPSS 0.41%
  1. Published19 Aug 2025

Description

Malicious pages could use Firefox for iOS to pass FIDO: links to the OS and trigger the hybrid passkey transport. An attacker within Bluetooth range could have used this to trick the user into using their passkey to log the attacker's computer into the target account. This vulnerability was fixed in Firefox for iOS 142 and Focus for iOS 142.

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 Focus< 142.0
Mozilla Firefox< 142.0

Remediation

Fixed in
Mozilla Firefox Focus≥ 142.0
Mozilla Firefox≥ 142.0

References

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Frequently asked

Is CVE-2025-55031 being actively exploited?

CVE-2025-55031 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.41%.

How severe is CVE-2025-55031?

CVE-2025-55031 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.41% probability of exploitation.

Which products are affected by CVE-2025-55031?

Affected products include Mozilla Firefox Focus, Mozilla Firefox.

How do I fix CVE-2025-55031?

Upgrade affected software to a fixed version, for example Mozilla Firefox Focus 142.0, Mozilla Firefox 142.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-55031 against the real software inventory on every managed device, every day. 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.