Information disclosure in Mozilla Firefox and Firefox ESR - CVE-2021-23953
Published: January 26, 2021
Vulnerability identifier: #VU50021
CSH Severity: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2021-23953
CWE-ID: CWE-200
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Mozilla Firefox
Firefox ESR
Mozilla Firefox
Firefox ESR
Software vendor:
Mozilla
Mozilla
Description
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to cross-origin information leak when processing PDF files. A remote attacker can create a specially crafted PDF file, trick the victim into opening it and gain access to sensitive information via redirected PDF requests, when said information is served as chunked data.
Remediation
Install updates from vendor's website.