SecuriTricks - CVE-2025-5020

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 affects Firefox for iOS < 139.

Product(s) Impacted

Vendor	Product	Versions
Mozilla	Firefox	*

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-939

Improper Authorization in Handler for Custom URL Scheme

The product uses a handler for a custom URL scheme, but it does not properly restrict which actors can invoke the handler using the scheme.

*CPE(s)

Affected systems and software identified for this CVE.

Type	Vendor	Product	Version	Update	Edition	Language	Software Edition	Target Software	Target Hardware	Other Information
a	mozilla	firefox	/	<139>*	/	/	/	/	/

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1951558

https://www.mozilla.org/security/advisories/mfsa2025-39/

CVSS Score

4.3 / 10

CVSS Data - 3.1

Attack Vector: NETWORK
Attack Complexity: LOW
Privileges Required: NONE
Scope: UNCHANGED
Confidentiality Impact: NONE
Integrity Impact: LOW
Availability Impact: NONE

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

View Vector String

Timeline

Published: May 21, 2025, 6:15 p.m.
Last Modified: May 21, 2025, 8:24 p.m.

Status : Awaiting Analysis

CVE has been marked for Analysis. Normally once in this state the CVE will be analyzed by NVD staff within 24 hours.

More info

Source

security@mozilla.org

CVE-2025-5020