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CVE-2025-8043

Mozilla Firefox vulnerability

9.8 CRITICALPublic exploitEPSS 0.38%
  1. Published22 Jul 2025

Description

Focus incorrectly truncated URLs towards the beginning instead of around the origin. This vulnerability was fixed in Firefox 141.

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< 141.0
Mozilla Thunderbird< 141.0

Remediation

Fixed in
Mozilla Firefox≥ 141.0
Mozilla Thunderbird≥ 141.0

References

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Frequently asked

Is CVE-2025-8043 being actively exploited?

CVE-2025-8043 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.38%.

How severe is CVE-2025-8043?

CVE-2025-8043 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.38% probability of exploitation.

Which products are affected by CVE-2025-8043?

Affected products include Mozilla Firefox, Mozilla Thunderbird.

How do I fix CVE-2025-8043?

Upgrade affected software to a fixed version, for example Mozilla Firefox 141.0, Mozilla Thunderbird 141.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-8043 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.