Is CVE-2025-55030 in the CISA KEV catalog?

No. CVE-2025-55030 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-55030?

CVE-2025-55030 has a CVSS v3 base score of 6.1 (MEDIUM).

What is the EPSS score for CVE-2025-55030?

CVE-2025-55030 has an EPSS score of 0.15% (4th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-55030?

Upgrade DeveloperEdition to 142.0 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2025-55030

MEDIUM

6.1

CVSS v3

NVD

Description

Firefox for iOS would not respect a Content-Disposition header of type Attachment and would incorrectly display the content inline rather than downloading, potentially allowing for XSS attacks. This vulnerability was fixed in Firefox for iOS 142.

CWE-640

How to fix

Remediation Available

DeveloperEditionWindows application

Affected:142.0Fixed in:142.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:142.0Fixed in:142.0Mozilla

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

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

0.15%probability of exploitation in 30 days

4thpercentile

Low risk: more likely to be exploited than 4% of all known CVEs.

References

Vendor Advisory1

mozilla.org

Issue Tracking1

bugzilla.mozilla.org

Related Vulnerabilities

Other CWE-640 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-18818	Critical	9.8	98%	-	-
CVE-2023-7028	Critical	10.0	95%	KEV	Fix
CVE-2017-7615	High	8.8	91%	-	-
CVE-2024-2862	Critical	9.1	51%	-	-
CVE-2019-19844	Critical	9.8	35%	-	Fix
CVE-2025-6216	Critical	9.8	29%	-	Fix

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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.