Mozilla Firefox, Firefox ESR, and Thunderbird Use-After-Free Vulnerability

Added to KEV
2023-06-22
Federal due date
2023-07-13
Vendor
Mozilla
Product
Firefox, Firefox ESR, and Thunderbird
EPSS
99.4th percentile (score 0.848, as of 2026-06-08)
NVD CVSS v3.1
Ransomware use
Unknown
Upstream
https://nvd.nist.gov/vuln/detail/CVE-2016-9079

CISA short description

Mozilla Firefox, Firefox ESR, and Thunderbird contain a use-after-free vulnerability in SVG Animation, targeting Firefox and Tor browser users on Windows.

Required action

Apply updates per vendor instructions.

EPSS percentile is the FIRST.org exploit-probability ranking as of the date noted above; it moves daily. CVSS reflects NVD's analysis at time of publication.