Is CVE-2025-5020 in the CISA KEV catalog?

No. CVE-2025-5020 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-5020?

CVE-2025-5020 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2025-5020?

CVE-2025-5020 has an EPSS score of 0.20% (10th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-5020?

Upgrade DeveloperEdition to 139.0 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2025-5020

MEDIUM

4.3

CVSS v3

NVD

Description

Opening maliciously-crafted URLs in Firefox from other apps such as Safari could have allowed attackers to spoof website addresses if the URLs utilized non-HTTP schemes used internally by the Firefox iOS client. This vulnerability was fixed in Firefox for iOS 139.

CWE-939

How to fix

Remediation Available

DeveloperEditionWindows application

Affected:139.0Fixed in:139.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:139.0Fixed in:139.0Mozilla

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

0.20%probability of exploitation in 30 days

10thpercentile

Low risk: more likely to be exploited than 10% of all known CVEs.

References

Vendor Advisory1

mozilla.org

Other references1

bugzilla.mozilla.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-13.