VULNERABILITY INTELLIGENCE
CVE-2015-4520
CVSS score6.4 MEDIUM
EPSS probability3.09%
CISA KEVNot currently listed
Published2015-09-24
Last modified2026-06-17
CVSS vectorAV:N/AC:L/Au:N/C:P/I:P/A:N
Description
Mozilla Firefox before 41.0 and Firefox ESR 38.x before 38.3 allow remote attackers to bypass CORS preflight protection mechanisms by leveraging (1) duplicate cache-key generation or (2) retrieval of a value from an incorrect HTTP Access-Control-* response header.