Vulnerability in Mozilla Firefox

CVE-2015-4520

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.

Published · last modified .

CVSS v2 metric

CVSS v2 base score 6.4 (Medium). Vector: AV:N/AC:L/Au:N/C:P/I:P/A:N. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.031 (87.2th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 87.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2015-4520: held from 0.031 to 0.031.

EPSS over last 30 days · oldest: 0.031 · newest: 0.031 · change: 0.000

Affected products

Weakness classification (CWE)

References