#VU103610 Improper certificate validation in Mozilla products - CVE-2025-1014


Vulnerability identifier: #VU103610

Vulnerability risk: Low

CVSSv4.0: 0.5 [CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-1014

CWE-ID: CWE-295

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Mozilla Firefox
Client/Desktop applications / Web browsers
Firefox ESR
Client/Desktop applications / Web browsers
Firefox for Android
Mobile applications / Apps for mobile phones

Vendor: Mozilla

Description

The vulnerability allows a remote attacker to gain bypass implemented security restrictions.

The vulnerability exists due to improper certificate validation when adding certificates to a store. Firefox did not check certificate length, resulting only in trusted data being checked. A remote attacker can trick the victim into importing a malicious certificate into the certificate store and perform MitM attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 120.0 - 134.0.2

Firefox ESR: 128.0 - 128.6.0

Firefox for Android: 120.0 - 134.0


External links
http://www.mozilla.org/en-US/security/advisories/mfsa2025-09/
http://www.mozilla.org/en-US/security/advisories/mfsa2025-07/


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.


Latest bulletins with this vulnerability