How severe is CVE-2025-4090?

CVE-2025-4090 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2025-4090 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-4090?

CVE-2025-4090 primarily affects Mozilla Firefox. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-4090?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-4090 have an EU (EUVD) identifier?

Yes. CVE-2025-4090 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-12646.

When was CVE-2025-4090 published?

CVE-2025-4090 was published on 2025-04-29 and last updated on 2026-06-17.

CVE-2025-4090

CVE-2025-4090 is a medium-severity vulnerability in Mozilla Firefox with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-532.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-12646
Weakness: CWE-532
Affected product: Mozilla Firefox
Published: 2025-04-29
Last modified: 2026-06-17

Description

A vulnerability existed in Thunderbird for Android where potentially sensitive library locations were logged via Logcat. This vulnerability was fixed in Firefox 138 and Thunderbird 138.

Frequently asked questions

What is CVE-2025-4090?: A vulnerability existed in Thunderbird for Android where potentially sensitive library locations were logged via Logcat. This vulnerability was fixed in Firefox 138 and Thunderbird 138.
How severe is CVE-2025-4090?: CVE-2025-4090 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2025-4090 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-4090?: CVE-2025-4090 primarily affects Mozilla Firefox. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-4090?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-4090 have an EU (EUVD) identifier?: Yes. CVE-2025-4090 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-12646.
When was CVE-2025-4090 published?: CVE-2025-4090 was published on 2025-04-29 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*

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