#VU46963 Spoofing attack in Mozilla Firefox and Firefox ESR

Published: 2020-09-23

Vulnerability identifier: #VU46963

Vulnerability risk: Low

CVSSv3.1: 3 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-15677


Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Mozilla Firefox
Client/Desktop applications / Web browsers
Firefox ESR
Client/Desktop applications / Web browsers

Vendor: Mozilla


The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to way Firefox displays name of the data origin when downloading files. A remote attacker can spoof origin of the downloaded file and display the name of the intermediate website instead of the original source name.

Successful exploitation of this vulnerability may allow a remote attacker to perform a phishing attack but requires that the spoofed website has an open redirect vulnerability.

Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 60.0 - 80.0.1

Firefox ESR: 78.0 - 78.2.0, 68.0 - 68.12.0, 60.0 - 60.9.0

External links

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