Information disclosure in Firefox ESR and Mozilla Firefox - CVE-2020-26966
Published: November 17, 2020
Vulnerability identifier: #VU48470
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2020-26966
CWE-ID: CWE-200
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Affected software:
Firefox ESR
Mozilla Firefox
Mozilla Thunderbird
firefox (Alpine package)
firefox-esr (Alpine package)
thunderbird (Alpine package)
Firefox for Android
Firefox ESR
Mozilla Firefox
Mozilla Thunderbird
firefox (Alpine package)
firefox-esr (Alpine package)
thunderbird (Alpine package)
Firefox for Android
Detailed vulnerability description
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to the way Firefox performs searches of single-word queries. Searching for a single word from the address bar cause an mDNS request to be sent on the local network searching for a hostname consisting of that string. A remote attacker with the local network can intercept the DNS query and obtain information, searched via browser address bar.
Note, the vulnerability affects Windows users only.
How to mitigate CVE-2020-26966
Install updates from vendor's website.